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Cl
Klaa
- Klaan, Inge (* 1965), German politician (CDU), State Secretary in Thuringia
- Klaar, Adalbert (1900–1981), Austrian architect, civil engineer, author, building researcher, scientist and preservationist
- Klaar, Alfred (1848–1927), critic and writer
- Klaar, Ernst (1861–1920), German writer
- Klaar, Helene (* 1948), Austrian lawyer
- Klaar, Karl (1865–1952), Austrian archivist and historian
- Klaar, Norbert (* 1954), German sports shooter
- Klaar, Sascha (* 1971), German boogie-woogie pianist
- Klaas, Hans (1927–2011), German entrepreneur
- Klaas, Kathrin (* 1984), German hammer thrower
- Klaas, Max (* 1993), young German musician and percussionist
- Klaas, Sebastian (* 1998), German soccer player
- Klaas, Walter (1895–1978), German lawyer and judge at the Federal Constitutional Court
- Klaas, Walter (1904–1961), German pastor and professor for the history of dogma and theology
- Klaas, Werner (1914–1945), German soccer player
- Klaasen, Jelle (* 1984), Dutch dart player
- Klaasen, Klaas (* 1955), German concert organizer as well as children's book and crime writer
- Klaasen, Raven (* 1982), South African tennis player
- Klaasen, Thandi (1931–2017), South African jazz singer
- Klaassen, Davy (* 1993), Dutch soccer player
- Klaassen, Lena (* 1991), German athlete
- Klaassen, Mait (* 1955), Estonian scientist and politician, member of the Riigikogu
- Klaaste, Aggrey (1940-2004), South African journalist
- Klaatsch, Hermann (1863–1916), German anthropologist
- Klaauw, Chris van der (1924–2005), Dutch diplomat and politician
Klab
- Klabacher, Stefan (* 1959), Austrian motorcycle racer
- Klaban, Rudolf (* 1938), Austrian medium and long-distance runner
- Kläber, Jürgen (* 1959), German modern pentathlete
- Kläber, Thomas (* 1955), German photographer
- Klabiński, Bronisław (1924–1999), Polish cyclist
- Klabiński, Edward (1920–1997), French racing cyclist
- Klabiński, Władysław (1925–2004), French-Polish cyclist
- Klabinus, Fritz († 1945), Austrian art historian
- Klablena, Eduard (1881–1933), Austrian artist
- Klabon, Krzysztof , Polish composer, lutenist and singer
- Klabund (1890–1928), German writer
- Klabunde, Boris (* 1978), German guitarist, singer and songwriter
- Klabunde, Clara (1906–1994), German lawyer and the first German with the rank of court president
- Klabunde, Erich (1907–1950), German politician (SPD), MdHB, MdB
- Klabunde, Helmut (* 1935), German officer, most recently Major General dR
Klac
- Klačan, Patrik (* 1997), Slovak football player
- Klačanský, Lukáš (* 1981), Slovak badminton player
- Klácel, František Matouš (1808–1882), Czech poet, journalist and philosopher
- Klacl, Fritz , Austrian soccer player
- Klaczko, Julian (1825–1906), Polish writer, publicist and politician
Klad
- Kladis, Danny (1917–2009), American racing driver
- Kladnik, Matjaž (* 1975), Slovenian ski jumper
- Kladny, Bernd (* 1960), German orthopedic surgeon and trauma surgeon
- Klado, Nikolai Lavrentjewitsch (1862–1919), Russian admiral, naval historian and theorist
- Kladrubský, Jiří (* 1985), Czech football player
- Klädtke, Reinhard (* 1960), German motorcycle athlete and Six Days winner
- Kladzig, Auguste (1810–1875), German theater actress, singer and writer
Klae
- Klaeber, Friedrich (1863–1954), German Anglicist
- Klæbo, Johannes Høsflot (* 1996), Norwegian cross-country skier
- Klaeden, Eckart von (* 1965), German politician (CDU), Member of the Bundestag
- Klaeden, Sandra von (* 1969), German lawyer and politician (CDU)
- Klaehn, Theodor (1883–1963), German educator and National Socialist functionary
- Klaehr, Carl Gottfried (1773–1842), German comedy poet and porcelain painter
- Klængur Þorsteinsson (1102–1176), Icelandic bishop
- Klaer, Markus (1968–2020), German politician (CDU), MdA
- Klaer, Werner (1929–2011), German politician (SPD), MdL
- Klaeren, Herbert (* 1950), German computer scientist and professor for practical computer science
- Klaeren, Klaus (* 1957), German triathlon organizer, author and triathlete
- Klaes, Ulrich (* 1946), German hockey player
- Klaesi, Jakob (1883–1980), Swiss psychiatrist
- Klæstad, Helge (1885–1965), Norwegian lawyer, judge at the International Court of Justice (1946–1961)
- Klæstrup, Nikita (* 1994), Danish photo model and member of the Liberal Alliance party
- Klaette, Adam von (1781–1851), Prussian lieutenant general
- Klaeukens, Desiree (* 1985), German singer-songwriter
Klaf
- Klafböck, Franz (1906–1969), Austrian civil servant and politician
- Klaff, Wanda (1922–1946), German concentration camp guard
- Klaff-Isselmann, Irmgard (* 1957), German politician (CDU), MdL
- Klaffenbach, Günther (1890–1972), German epigraphist
- Klaffenböck, Klaus (* 1968), Austrian motorcycle racer
- Klaffenböck, Rudolf (* 1952), Austrian cabaret artist, writer, documentary filmmaker and photographer
- Klaffke, Kaspar (* 1937), German landscape architect, author and editor and head of the authorities
- Klaffke, Martin (* 1971), German economist, professor of business administration and editor of specialist books
- Klaffl, Han’s (* 1950), German cabaret artist
- Klaffner, Melanie (* 1990), Austrian tennis player
- Klaffus, Ernst (1935–2011), German officer, head of the Army Office
- Klaffus, Gerhard Ernst-Peter (* 1964), German Army Officer, Brigadier General of the Bundeswehr
- Klafki, Anja (* 1967), German graphic artist
- Klafki, Wolfgang (1927–2016), German educationalist and university professor
- Klafsky, Katharina (1855-1896), opera singer (soprano)
Lament
- Klag, Peter (* 1952), German soccer player and coach
- Klagemann, Eberhard (1904–1990), German film producer
- Klagemann, Eugen (1902–1980), German cameraman
- Klagemann, Hans , German jazz and entertainment musician (drums)
- Kläger, Emil (1880–1936), Austrian journalist
- Kläger, Fritz (1914–2007), German motorcycle racing driver and designer
- Kläger, Max (1925–2016), German art educator and artist
- Kläger, Wilhelm (1814–1875), German actor, director and playwright
- Klages, Christian († 1901), German entrepreneur
- Klages, Ellen (* 1954), American writer
- Klages, Friedrich (1904–1989), German chemist, university professor and author
- Klages, Gerhard (1915–2017), German physicist
- Klages, Heinrich (1875–1969), German entrepreneur
- Klages, Helmut (* 1930), German sociologist and administrative scientist
- Klages, Karl (1881–1967), German politician (CDU) and member of the Bremen citizenship
- Klages, Karl (1904–1967), German educator and politician (SPD), MdL
- Klages, Ludwig (1872–1956), German philosopher and psychologist
- Klages, Matthias (* 1959), German voice actor and photographer
- Klages, Otto (1903–1982), German fossil collector
- Klages, Paul (1899–1959), German aircraft designer
- Klages, Simone (* 1956), German children's book author and illustrator
- Klages, Wilhelm August Hermann (1871–1957), German chemist and university professor
- Klagge, Matthias (* 1970), German lawyer and television actor
- Klagges, Dietrich (1891–1971), German politician (NSDAP), MdR, Prime Minister of Braunschweig during the Nazi era
- Klagges, Dirk-Friedrich (* 1960), German general physician and commander of the NATO Center of Excellence for Military Medicine
- Klagholz, Wilhelm (1905–1984), German sculptor (animal figures) and master plumber
- Klagsbrunn, Kurt (1918–2005), Austrian-Brazilian photographer
Klah
- Klahn, Anita (* 1960), German politician (FDP), MdL
- Klahn, Bradley (* 1990), American tennis player
- Klahn, Erich (1901–1978), German visual artist
- Klähn, Friedrich Joachim (1895–1969), German writer
- Klahn, Klaus Hinrich (1776–1851), German trader, emigrant and city founder
- Klähn, Wolfgang (1929–2019), German painter, poet, composer
- Klaholz, Josef , German politician (CDU) and mayor of the city of Brilon
- Klahr, Alfred (1904–1944), Austrian political scientist, communist and journalist
- Klahr, Detlef (* 1957), Lutheran theologian and state superintendent
- Klähr, Franziska (1774–1850), Austrian benefactress
- Klahr, Michael the Elder (1693–1742), German sculptor
- Klahr, Michael the Younger (1727–1807), German sculptor
Klai
- Klaiber, Gustav (1864–1940), German businessman, farmer and member of the Baden state parliament
- Klaiber, Joachim (1908–2003), German opera director and director
- Klaiber, Karl Hermann (1835–1896), Wuerttemberg pastor and local researcher
- Klaiber, Klaus-Peter (* 1940), German diplomat
- Klaiber, Manfred (1903–1981), German diplomat
- Klaiber, Rudolf (1873–1957), German administrative lawyer and police chief in Stuttgart
- Klaiber, Walter (* 1940), Methodist Bishop
- Klaiber-Gottschau, Pauline (1855–1944), German literary translator
- Klainerman, Sergiu (* 1950), Romanian-American mathematician
- Klainguti, Göri (* 1945), Swiss writer
- Klais, Hans Gerd (* 1930), German organ builder
- Klais, Johannes (1852–1925), organ builder
Klaj
- Klaj, Johann (1616–1656), German poet of the Baroque period
- Klaje, Hermann (1868–1945), German high school teacher and historian
- Klajn, Hugo (1894–1981), Yugoslav psychoanalyst and theater director
- Klajner, Daniel (* 1963), Swiss general music director
Klak
- Klak, Jan (* 1942), Czechoslovak economist, politician and minister
- Klak, Lyudmila Nikolajewna (* 1982), Russian skeleton pilot
- Klakegg, Bjørn (* 1958), Norwegian jazz guitarist
- Klakow, Hans (1899–1993), German sculptor
- Klakstein, Bára Skaale (* 1973), Faroese soccer player and coach
Klam
- Klam, Walter (1904–1983), German actor and radio play speaker
- Klama, Dieter Olaf (* 1935), German graphic artist and painter
- Klamann, Kurt (1907–1984), German draftsman and caricaturist
- Klamar Fuik, Pedro , East Timorese activist and soldier
- Klambauer, Andrea (* 1977), Austrian politician (NEOS), regional councilor
- Klambauer, Erwin (* 1968), Austrian flautist and university professor
- Klambauer, Günter (* 1982), Austrian bioinformatician and judoka
- Klambauer, Otto (1949–2013), Austrian historian and journalist
- Klamburg, Paula (* 1989), Spanish synchronized swimmer
- Klamer, Rachel (* 1990), Dutch triathlete
- Klamert, Teresa (* 1992), German actress
- Klameth, Thomas (* 1943), Swiss actor and sports teacher
- Klamfoth, Hermann , German writer and author
- Klami, Uuno (1900–1961), Finnish composer
- Klamm, Hannelore (* 1949), German politician (SPD), MdL
- Klammer, Bruno (* 1938), Italian writer (South Tyrol)
- Klammer, David (* 1961), German photographer
- Klammer, Franz (* 1953), Austrian ski racer and motor sportsman
- Klammer, Karl Anton (1879–1959), Austrian officer and translator
- Klammer, Markus (* 1955), Italian art critic and curator
- Klammer, Markus (1963–1993), German painter, sculptor and sculptor
- Klammer, Mathias (* 1988), Austrian writer
- Klammer, Michael (* 1980), Italian actor with a German-speaking background
- Klammer, Nikolaus (1769–1830), Austrian ivory carver and drawing teacher
- Klammer, Robert , German musician in the field of new music / improvisation music
- Klammet, Gerhard (1914–1990), German photographer and documentary filmmaker
- Klamminger, Franz (1897–1957), Austrian politician, member of the state parliament (Lower Austria)
- Klamminger, Josef (* 1955), Austrian police officer, State Police Director of Styria
- Klammt, Günther (1898–1971), German officer, most recently major general in World War II
- Klammt, Karl (1912–1987), German politician (GB / BHE), MdL Bavaria
- Klammt, Peter (* 1957), German soccer player
- Klampäckel, Gerhard (1919–1998), German painter, graphic artist and sculptor
- Klampanis, Petros (* 1981), Greek jazz musician and composer
- Klampár, Tibor (* 1953), Hungarian table tennis player
- Klampen, Dietrich zu (* 1959), German publisher and bookseller
- Klampfer, Josef (1892–1962), Austrian crib artist
- Klampfl, Bernhard (* 1976), Austrian actor
- Klamroth, Anton (1860–1929), German portrait painter and pastel painter
- Klamroth, Bernhard (1910–1944), German officer, involved in the assassination attempt on Adolf Hitler on July 20, 1944
- Klamroth, Hans Georg (1898–1944), confidante of the planned assassination attempt on Adolf Hitler on July 20, 1944
- Klamroth, Jörn (1944–2011), German television producer
- Klamroth, Karl (1878–1976), German administrative lawyer, district administrator in Heilsberg and in the Dill district
- Klamroth, Kurt (1872–1947), German fertilizer manufacturer, chairman of the Association of German Fertilizer Manufacturers
- Klamroth, Kurt (1904–1961), German lawyer
- Klamroth, Lola (* 1991), German actress
- Klamroth, Louis (* 1989), German actor and presenter
- Klamroth, Martin (1855–1890), German Arabist and mathematician
- Klamroth, Sabine (* 1933), German lawyer and author
- Klamroth, Walter (1873–1946), German bank manager
- Klamt, Andrzej (* 1964), Polish-German documentary filmmaker
- Klamt, Ewa (* 1950), German politician (CDU). Member of the Bundestag, MEP
- Klamt, Gerd (* 1942), Austrian politician (FPÖ), member of the Federal Council
- Klamt, Hatto (* 1936), German senior university director and local politician (CDU)
- Klamt, Hermann (1884–1950), German lawyer and member of the Prussian state parliament
- Klamt, Jutta (1890–1970), German dancer, choreographer and dance teacher
clan
- Klan, Ulrich (* 1953), German musician, composer, comprehensive school teacher and libertarian author
- Klanac, John (* 1988), American volleyball player
- Klančnik, Karel (1917–2009), Yugoslav ski jumper
- Klandt, Christian (* 1978), German director, screenwriter, actor
- Klandt, Heinz (* 1947), German lecturer for entrepreneurship
- Klandt, Patric (* 1983), German soccer goalkeeper
- Kläner, Christian (* 1983), German fistball player
- Klanert, Karl (1873–1941), German music teacher, pianist, composer and oratorio singer
- Klanfer, Julius (1909–1967), Austrian social scientist and journalist
- Klang, Heinrich (1875–1954), Austrian legal scholar
- Klang, Klaus (* 1956), German politician (CDU), State Secretary in Saxony-Anhalt
- Klaniczay, Gábor (* 1950), Hungarian historian
- Klaniczay, Tibor (1923–1992), Hungarian literary scholar
- Klank, Wolfgang (1930–1998), German soccer player
- Klankermeier, Max (1909–1996), German motorcycle and automobile racing driver
- Klann, Erich (1896–1948), German politician of the KPD
- Klann, Erich (* 1987), German dancer and dance trainer
- Klann, Gerhardt (* 1976), Canadian biathlete
- Klann, Günter (* 1942), German athlete
- Klann, Harry Paul (* 1970), Canadian biathlete
- Klann-Delius, Gisela (* 1944), German psychologist and professor for linguistics at the Free University of Berlin
- Klanner, Robert (* 1945), Austrian experimental physicist and university professor
- Klánský, Ivan (* 1948), Czech pianist and music teacher
- Klant, Joop (1915–1994), Dutch economist and author
- Klant, Joseph (1869–1927), German politician (NSDAP), Member of the Bundestag, NSDAP Gauleiter
- Klante, Johanna (* 1976), German actress
- Klante, Max († 1955), German betting fraudster
- Klanten, Robert (* 1964), German art book publisher
Klao
- Klaos, Elmar (* 1899), Estonian football player
Clap
- Klapáč, Jan (* 1941), Czechoslovak national ice hockey player
- Klapalová, Hana (* 1982), Czech beach volleyball player
- Klapczynski, Joachim (1929-2006), German politician (LDPD)
- Klapdor-Kleingrothaus, Hans (* 1942), German physicist
- Klappek, Milan (* 1944), Czech clergyman, Protestant theologian
- Klapf, Wolfgang (* 1978), Austrian soccer player
- Klapfer, Lukas (* 1985), Austrian Nordic combined athlete
- Klapheck, Andrea (* 1967), German rower
- Klapheck, Anna (1899–1986), German art historian and art critic
- Klapheck, Elisa (* 1962), German rabbi
- Klapheck, Konrad (* 1935), German painter, artist and art professor
- Klapheck, Richard (1883–1939), German art historian, professor of art history
- Klapheck, Wolfgang (* 1966), German rower
- Klapisch, Cédric (* 1961), French director, actor and screenwriter
- Klapisch-Zuber, Christiane (* 1936), French historian, specialist on the European Middle Ages
- Klapka, Filip (* 1981), Czech football player
- Klapka, Georg (1820-1892), Hungarian general (1848/49)
- Klapka, Josef (1786–1863), printer, journalist, publisher, mayor, member of the Hungarian Reichstag
- Klapkarek, Nicolaj (* 1965), German swimmer
- Klapmeyer, Johann Hinrich († 1757), German organ builder
- Klapmeyer, Johann Hinrich (1724–1792), German organ builder
- Klapötke, Thomas M. (* 1961), German inorganic chemist
- Klapp, Adolf (1834–1925), Member of the Landtag Waldeck
- Klapp, Ernst (1894–1975), German agricultural scientist
- Klapp, Karl (1857–1932), Member of Parliament Waldeck
- Klapp, Michael (1834–1888), Austrian poet
- Klapp, Otto (1922–1986), German Romance scholar, librarian and bibliographer
- Klapp, Richard , German administrative lawyer, lawyer and royal Prussian district administrator
- Klapp, Rudolf (1873–1949), German surgeon
- Klappauf, Lothar (* 1953), German archaeologist
- Klappenbach, Tina (* 1965), German beach volleyball player
- Klapper, Gottfried (1917–2003), German theologian, managing director of the German National Committee of the Lutheran World Federation and holder of the Silesian Shield
- Klapper, Helmut (1932–2019), German limnologist
- Klapper, Johannes , German basketball player and coach
- Klapper, Joseph (1880–1967), German philologist and folklorist
- Klapper, Martin (* 1963), Czech musician and multimedia artist
- Klapper, Siegfried (1918–2012), German painter
- Klapper-McNally, Lianne , film director and film producer
- Klappert, Bertold (* 1939), German Protestant theologian and professor of systematic theology
- Klappert, Marianne (1943–2008), German politician (SPD), Member of the Bundestag
- Klappert, Sören (* 1990), German soccer player
- Klapproth, Alexander (* 1956), Swiss university professor
- Klapproth, Edeltraut (1909–2005), German painter
- Klapproth, Erich (1894–1945), “Feme judgment executor” of the “Black Reichswehr”, later NSDAP functionary and landowner
- Klapproth, Helmut (1928–2011), German politician (SED)
- Klapproth, Rosa (1899–1975), member of the Black Reichswehr
- Klapproth, Ruedi (1925–2012), Swiss writer for young people
- Klapproth, Stephan (* 1958), Swiss television presenter
- Klapproth, Walter (* 1921), German soccer player
- Klapproth, Willy (1892–1967), Chief of Police in Frankfurt am Main
- Klapprott, Bernhard (* 1964), German harpsichordist, clavichord player, organist and ensemble leader
- Klaproth, Heinrich Julius (1783–1835), German orientalist
- Klaproth, Martin Heinrich (1743-1817), German chemist
- Klaproth, Paul (1862–1947), German banker and business leader
- Klaps, Hans (1936–2015), German politician (SPD), MdL
- Klapuch, Josef (1906–1985), Czechoslovak wrestler and actor
Clear
- Sure, Alexander (* 1968), German art historian and museum director
- Sure, Alois (1763–1833), Bohemian philologist, co-founder of the Prague educational institution for the blind
- Sure, Christian (* 1952), German terrorist of the Red Army faction
- Sure, Dieter (* 1937), German photographer and photojournalist
- Sure, Elisabeth (* 1986), Austrian author
- Sure, Ernst (* 1952), German surgeon and university professor
- Sure, Heribert (1933–1992), German Rechtspfleger and author
- Klär, Hildegard (* 1940), German politician (SPD), MdL
- Sure, Jakob (1783–1833), Bavarian administrative lawyer and politician
- Sure, Joachim (1909–1996), German rector and home nurse
- Klär, Karl-Heinz (* 1947), German politician (SPD)
- Sure, Katharina (* 1987), Austrian actress
- Sure, Martin (1886–1966), German art historian
- Sure, Michael (* 1943), German graphic artist, designer and university professor
- Sure, Philipp (* 1992), Austrian soccer player
- Sure, Thomas A. , German physicist
- Klara (1321–1368), Countess of Freiburg
- Clare of Assisi († 1253), founder of the Order of the Poor Clares
- Clare of Montefalco (1268–1308), virgin, saint, abbess
- Klara von Sachsen-Lauenburg (1518–1576), Duchess of Braunschweig-Gifhorn
- Klara, August Philipp (1790–1850), Estonian painter, engraver and engraver
- Klare, Arno (* 1952), German politician (SPD), Member of the Bundestag
- Klare, Bernhard Johannes , German lawyer and politician (NSDAP)
- Klare, Felix (* 1978), German actor
- Klare, Hermann (1909–2003), German chemist and President of the Academy of Sciences of the GDR
- Klare, Jan (* 1961), German jazz musician and composer
- Klare, Johannes (* 1930), German Romanist and Lusitanist
- Klare, Jörn (* 1965), German journalist and non-fiction author
- Klare, Karl (1922–1995), German politician (CDU), MdL
- Klare, Karl-Heinz (* 1948), German politician (CDU), MdL
- Klare, Kurt (1885–1954), German physician, university professor and Nazi medical officer
- Klare, Margaret (* 1932), German writer
- Klare, Mona (* 1966), German actress and trained systemic coach
- Klare, Stefan (* 1971), German racing cyclist
- Klaren, Georg C. (1900–1962), Austrian director and screenwriter
- Klarer, Christoph (* 2000), Austrian soccer player
- Klarer, Elizabeth (1910-1994), allegedly abducted by aliens
- Klarer, Josef (1898–1953), German chemist
- Klarer, Martin (* 1982), German soccer player
- Klarer, Walter (1500–1567), Swiss Evangelical Reformed pastor, reformer, innkeeper and chronicler
- Klareskog, Lars (* 1945), Swedish physician
- Klaret , Canon on St. Vitus Cathedral in Prague
- Klarić, Danijel (* 1995), Croatian football player
- Klarić, Sara (* 1993), Croatian soccer player
- Klarik, Jeffrey , American screenwriter and producer
- Klärle, Martina (* 1967), German engineer
- Klarman, Seth (* 1957), American hedge fund manager and billionaire
- Klarmann, Irmgard (* 1957), German songwriter and music producer
- Klarmann, Johann (* 1939), German politician (SPD), MdHB
- Klärner, Andreas (* 1970), German sociologist
- Klarner, Gerhard (1927–1990), German news anchor
- Klarsfeld, Arno (* 1965), French-Israeli lawyer and politician
- Klarsfeld, Beate (* 1939), German-French journalist and Holocaust researcher
- Klarsfeld, Serge (* 1935), French lawyer and historian
- Klarström, Andreas (* 1977), Swedish football player
- Klartag, Bo'az (* 1978), Israeli mathematician
- Klarwein, Franz (1914–1991), German opera singer (lyric tenor)
- Klarwein, Mati (1932–2002), German painter
- Klarwein, Michaela , German actress
- Klarwein, Ossip (1893–1970), German-Israeli architect
Class
- Klas, Eri (1939–2016), Estonian conductor
- Klas, Maximilian (* 1990), German actor
- Klasa, Michal (* 1953), Czechoslovak cyclist
- Klaschik, Eberhard (* 1943), German palliative medicine specialist
- Klaschka, Carmen (* 1987), German tennis player
- Klaschka, Mathias (* 1970), German screenwriter
- Klaschka, Siegfried (* 1955), German sinologist
- Klasen, Anna (* 1993), German tennis player
- Klasen, Arno (* 1967), German racing driver
- Klasen, Charlotte (* 1995), German tennis player
- Klasen, Jacqueline (* 1994), German soccer player
- Klasen, Jörn (* 1951), German doctor for internal medicine, anthroposophic medicine and naturopathy
- Klasen, Karl (1909–1991), German lawyer, President of the Deutsche Bundesbank (1970–1977)
- Klasen, Karl Christian (1911–1945), German painter and graphic artist
- Klasen, Linus (* 1986), Swedish ice hockey player
- Klasen, Odilo (* 1959), German organist and composer
- Klasen, Peter (* 1935), German sculptor, painter and photographer
- Klasen, Sepp (* 1935), German politician (SPD), MdL
- Klasen, Stephan (* 1966), German development economist and university professor
- Klasen, Thomas (* 1983), German soccer player
- Kläsener, Alexander (1826–1912), German-Dutch church painter and Nazarene of the Düsseldorf School
- Kläsener, Hubertus (* 1988), German show jumper
- Kläsener, Stefan (* 1964), German journalist and theologian
- Kläsener, Thomas (* 1976), German soccer player
- Klasenius, Mathias (* 1975), Swedish assistant football referee
- Kläser, Martin (* 1987), German poker player
- Klashnekoff (* 1975), British rapper
- Klashorst, Peter (* 1957), Dutch photographer, sculptor and painter
- Klasing, August (1809–1897), German bookseller and publisher
- Klasing, August (1881–1958), German lawyer, publisher and bookseller and partner in the company "Velhagen & Klasing" in Bielefeld
- Klasing, Hermann (1859–1951), German writer, lawyer and notary
- Klasing, Johannes (1846–1927), German publisher
- Klasink, Berend (1874–1953), Protestant Reformed farmer and politician in the county of Bentheim
- Klasmeier, Christian (1894–1974), head of various trade supervisory offices
- Klasmeyer, Heinrich (1887–1963), German trade unionist and politician
- Klasnić, Ivan (* 1980), Croatian football player
- Klasnic, Waltraud (* 1945), Austrian politician (ÖVP), Governor of Styria, member of the Federal Council
- Klaß, Albert von (1801–1873), Prussian major general and commander of the 30th Infantry Brigade
- Klass, Alisha (* 1972), American porn actress
- Kläß, Bernhard (1918–1981), German doctor and member of the Bavarian Senate
- Klaß, Christa (* 1951), German politician (CDU), MEP
- Klass, David (* 1960), American writer and screenwriter
- Klass, Dennis (* 1940), American psychologist of religion and professor emeritus
- Klass, Gert von (1892–1971), German business journalist, writer, screenwriter and biographer
- Klass, Günter (1936–1967), German racing driver
- Klaß, Johann Gotthilf Oskar von (1822–1887), Prussian major general and commander of the 18th Infantry Brigade
- Klass, Johannes (1879–1936), German architect and municipal building officer
- Klass, Justinus (1912–1944), German ancient historian
- Klass, Marvin (* 1988), German volleyball and beach volleyball player
- Klass, Myleene (* 1978), British actress, television and radio presenter, pianist, singer, reality TV participant and model
- Klass, Nadine (* 1975), German lawyer
- Klass, Philip J. (1919-2005), American ufologist
- Klaß, Wilhelm von (1786–1850), Prussian lieutenant general
- Klassen, Andrey (* 1984), Russian artist
- Klassen, Ben , American nationalist and religious founder
- Klassen, Cindy (* 1979), Canadian speed skater
- Klassen, Cornelius F. (1894–1954), personality of Mennonite famine relief and of Mennonite emigration and colonization in Russia, Canada and Europe
- Klassen, ET (1908–1990) American businessman
- Klassen, Eduard , Paraguayan harpist
- Klassen, Janina (* 1953), German musicologist
- Klassen, Jon (* 1981), Canadian illustrator and author
- Klaßen, Knut (* 1967), German artist
- Klassen, Lena (* 1971), German author
- Klassen, Leon (* 2000), Russian soccer player
- Klassen, Malcolm (* 1981), South African super featherweight boxer and normal boom
- Klassen, Norbert (1941–2011), German-Swiss actor and performance artist
- Klassen, Peter (1903–1989), German diplomat
- Klassen, Peter (1935–2008), German sculptor
- Klassen, Peter P. (1926–2018), Russian Mennonite historian and author
- Klassen, Ralph (* 1955), Canadian ice hockey player
- Klaßen, Robert (* 1962), scientific author, software trainer and photographer
- Klassen, Sam (* 1989), Canadian-German ice hockey player
- Klaßen, Solveig (* 1969), German screenwriter and director
- Klässner, Bärbel (* 1960), German poet, prose writer
- Klassohn, Helge (* 1944), Protestant theologian
- Klassohn, Robert Eduardowitsch (1868–1926), Russian electrical engineer
- Klassou, Komi Sélom (* 1960), Togolese politician and Prime Minister
- Klášterka, Jakub (* 1994), Czech racing car driver
- Klášterský, Antonín (1866–1938), Czech poet
- Klastersky, Wilhelm (1880–1961), Austrian lawyer
- Klasvogt, Peter (* 1957), German Catholic priest and writer
Klat
- Klata, Jan (* 1973), Polish theater director
- Klátik, Miloš (* 1963), Slovak theologian, Bishop of the Evangelical Church AB
- Klatka, Tony (* 1946), American jazz musician (trumpet, flugelhorn, arrangement)
- Klatschko, Samuel (1851-1914), Russian revolutionary
- Klatt, Andreas (* 1987), German poker player
- Klatt, Berthold (1885–1958), German zoologist
- Klatt, Edith (1895–1971), German writer
- Klatt, Friedrich Wilhelm (1825-1897), German botanist
- Klatt, Fritz (1888–1945), German reform pedagogue, writer and draftsman
- Klatt, Günther (1957–2012), German jazz saxophonist, painter and sculptor
- Klatt, Gustav (1823–1898), German Vice Admiral
- Klatt, Hartwig (* 1952), German soccer player
- Klatt, Heiko (* 1965), German lawyer specializing in media law and press law
- Klatt, Herbert (1909–1945), German actor
- Klatt, Jason (* 1986), Canadian pool player
- Klatt, Matthias (* 1973), German lawyer and university lecturer
- Klatt, Michael (* 1968), German football official
- Klatt, Paul (1896–1973), German lieutenant general in World War II and commander of the 3rd Mountain Division (Wehrmacht)
- Klatt, Raymond , German canoeist
- Klatt, Stefanie (* 1985), German volleyball and beach volleyball player
- Klatt, Trent (* 1971), American ice hockey player, coach and scout
- Klatt, Werner (* 1948), German rower
- Klatt, Wolfgang (1939–2016), German politician (SPD), Member of the Bundestag
- Klatte, Carsten (* 1969), German musician, singer, lyricist and composer
- Klatte, Diethard (* 1950), German mathematician and university professor
- Klatte, Edda (* 1953), German middle-distance runner
- Klatte, Elke (* 1953), German middle-distance runner
- Klatte, Ernst (1774–1837), Prussian cavalryman and writer on hippology
- Klatte, Fritz (1880–1934), German chemist
- Klatte, Ludwig (1893–1969), German ship carpenter and politician (SPD)
- Klatte, Wilhelm (1870–1930), German music theorist, music educator, music journalist and conductor
- Klatten, Eduard Albert Friedrich (1832-1892), royal Prussian lieutenant general and most recently inspector of the rifle factories
- Klatten, Susanne (* 1962), German entrepreneur
- Klatten, Werner (* 1945), German manager, CEO of EM.TV AG
- Klattenhoff, Diego (* 1979), Canadian actor
- Klatz, Hanns (1914–2009), German editor
- Klatzkin, Jakob , Hebrew philosophical writer and national Jewish publicist
Steal
- Klau, Ralf (* 1964), German soccer player
- Klaua, Dieter (1930–2014), German mathematician
- Klauber, Leo (1890–1935), German doctor
- Klaubert, Birgit (* 1954), German politician (Die Linke), MdL
- Klauck, Christoph , German computer scientist and university professor
- Klauck, Fritz (1923–1967), German journalist and politician (CDU), MdA
- Klauck, Hans-Josef (* 1946), German theologian
- Klauck, Horst , German soccer goalkeeper and national player
- Klaucke, Julius (1826–1903), German entrepreneur and inventor of the Klaucke stamp
- Klauda, Manfred (1936–2000), German collector and pedal car driver
- Klauda, Zdeněk (* 1979), Czech composer and musicologist
- Klauder, John (* 1932), American theoretical physicist
- Klaudios Nikostratos , ancient Greek philosopher
- Klauditz, Wilhelm (1903–1963), German wood researcher
- Klaudt, Evelyn (* 1971), German figure skater
- Klaudus, Rudolf (1895–1979), Austrian painter, educator and publicist
- Klaudy, Karel Leopold (1822–1894), Czech lawyer and politician
- Klaudy, Kurt (1905–2009), Austrian architect
- Klaudy, Peter (1903–1985), Austrian electrical engineer, pioneer in superconductivity
- Klaudy, Peter von , German table tennis player
- Klaue, Andreas (* 1962), German actor
- Klaue, Constanze (* 1985), German film director, author and jazz singer
- Klaue, Hermann (1912–2001), German engineer and inventor
- Klaue, Magnus , German literary critic, literary scholar and Germanist
- Klaue, Siegfried (* 1931), German legal scholar
- Klaue, Wolfgang (* 1935), German film archivist
- Klauenbösch, Marco (* 1996), Swiss floorball player
- Klauer, Georg (1876–1947), German lawyer
- Klauer, Harald (* 1960), German badminton player
- Klauer, Johann Christian Ludwig , German sculptor
- Klauer, Karl Christoph (* 1961), German social and cognitive psychologist
- Klauer, Karl Josef (* 1929), German educator, elementary and special school teacher and university teacher
- Klauer, Martin Gottlieb (1742–1801), German sculptor
- Klauer-Simonis, Albrecht (1918–2002), German artist, photographer, ceramist and art teacher
- Klauhold, Alfred (1818–1890), German lawyer
- Klauhold, Caroline (1812–1867), German portrait, genre and landscape painter
- Klauhs, Hellmuth (1928–1990), Austrian bank director
- Kläui, Henry (1880–1962), Swiss painter
- Kläui, Paul (1908–1964), Swiss historian
- Kläui, Wolfgang (* 1945), Swiss chemist and professor of inorganic chemistry
- Klauk, Markus (* 1973), German actor
- Klauke, Jürgen (* 1943), German artist
- Klauke, Ralf (* 1980), German cross-country summer biathlete
- Klaukien, Michael (* 1974), German composer
- Klauner, Friederike (1916–1993), Austrian art historian
- Klaunig, Gisa (* 1992), German handball player
- Klaunig, Karl (1824–1861), German educator
- Klaunig, Stefanie (* 1991), German handball player
- Klaup-McColl, Mari (* 1990), Estonian heptathlete
- Klaus the Geiger (* 1940), German songwriter and street musician
- Klaus von Urbach , German alchemist
- Klaus, Albert (1902–1983), German writer and children's book author
- Klaus, Alfred (1919–2008), German detective
- Klaus, Andreas (* 1937), German motorcycle racer
- Klaus, Bernd (* 1967), German soccer player and soccer coach
- Klaus, Bernhard (1913–2008), German Protestant theologian
- Klaus, Birgit (* 1964), German television presenter and author
- Klaus, Bruno (1848–1915), German teacher, local researcher and member of the state parliament
- Klaus, Canísio (* 1951), Brazilian clergyman, Roman Catholic bishop of Sinop
- Klaus, Carl (* 1994), German soccer goalkeeper
- Klaus, Christine Ursula (* 1957), German veterinarian and politician (SPD), MdL
- Klaus, Daniel (* 1972), German writer
- Klaus, David (1718–1793), German philosopher
- Klaus, Dieter (1938–2010), German geographer, mathematician and systems scientist
- Klaus, Edgar , agent
- Klaus, Elisabeth (* 1955), German sociologist and communication scientist
- Klaus, Emil (1907–1994), German farmer and winemaker
- Klaus, Erich (* 1953), German wrestler
- Klaus, Felix (* 1992), German soccer player
- Klaus, Frank (1887–1948), American boxer, world middleweight champion
- Klaus, Fred (1924–2005), German actor and voice actor
- Klaus, Fred (* 1967), German soccer player
- Klaus, Friedrich (1887–1964), German CDU politician, MdL
- Klaus, Georg (1912–1974), German Marxist philosopher, chess player and chess official
- Klaus, Gottfried (1899–1963), Swiss politician (SP)
- Klaus, Hans (1901–1985), German-speaking Czechoslovakian author
- Klaus, Heinrich (1876–1961), German politician (SPD)
- Klaus, Horst (* 1930), German trade unionist
- Klaus, Jakob , German barber and memoir author
- Klaus, Johannes (* 1981), German travel blogger, graphic designer and publisher
- Klaus, Josef (1910–2001), Austrian politician (ÖVP), member of the National Council and Federal Chancellor
- Klaus, Josef (* 1958), German ice hockey player
- Klaus, Julius (1849–1920), Swiss engineer, industrialist and racial hygienist
- Klaus, Julius (1910–1988), German local politician (CDU), Lord Mayor of Schwäbisch Gmünd
- Klaus, Konrad (* 1956), German Indologist
- Klaus, Lieke (* 1989), Dutch BMX athlete
- Klaus, Martin (* 1982), Swiss actor
- Klaus, Martin A. (* 1938), German journalist and writer
- Klaus, Matthias (1758–1833), Austrian politician, mayor of St. Pölten
- Klaus, Michael (1952–2008), German author
- Klaus, Oliver (* 1990), Swiss football player
- Klaus, Peter (* 1944), German economist and university professor
- Klaus, Philipp (* 1978), German handball player
- Klaus, Reinhold (1881–1963), Austrian painter, graphic artist and stained glass painter
- Klaus, Steffen , German film and theater actor
- Klaus, Tadeusz (* 1960), German composer
- Klaus, Ulrich (* 1950), German high school teacher and President of the German Tennis Association
- Klaus, Václav (* 1941), Czech economist and Prime Minister
- Klaus, Werner (* 1928), German soccer player
- Klaus, Wilfried (* 1941), German actor
- Klaus, Wolfgang (* 1930), German politician (SED), Lord Mayor of the City of Frankfurt (Oder) (1965)
- Klausa, Ekkehard (* 1941), German author and private lecturer in sociology
- Klausa, Udo (1910–1998), German district administrator and state director
- Klausberger, Gerhard (* 1950), Austrian politician (SPÖ), Upper Austrian Provincial Council, member of the National Council
- Klausberger, Maria Leopoldine (1888–1944), Austrian journalist and women's rights activist
- Klausch, Günter (1944–2018), German soccer player
- Klausch, Hans-Peter (1954–2016), German historian
- Klause, Eugen (1903–1999), German church musician and composer
- Klause, Gert-Dietmar (* 1945), German cross-country skier
- Klause, Michael (1895–1942), German worker and communist
- Klausen, Gottlieb Ernst (1762–1851), Danish teacher, poet and translator
- Klausen, Rudolf Heinrich (1807–1840), German classical philologist
- Klausen, Steinar (* 1982), Norwegian badminton player
- Klausener, Alfons (1853–1921), German mayor
- Klausener, Bruno , German administrative lawyer, lawyer and district administrator
- Klausener, Erich (1885–1934), German lawyer, representative of German political Catholicism and civil servant
- Klausener, Matthias (* 1962), Swiss actor
- Klausener, Peter (1844–1904), German administrative officer
- Klausener, Petrus (1782–1850), German Trappist monk and abbot of Oelenberg Abbey
- Klauser, Andreas (* 1965), Austrian manager
- Klauser, Arthur (1889–1959), police chief of Vienna
- Klauser, Charly (* 1990), German singer-songwriter, multi-instrumentalist and producer
- Klauser, Christoph (1924–2009), Austrian state politician (SPÖ)
- Klauser, Daniel (* 1981), Swiss politician (GPS)
- Klauser, Fritz (1957–2018), German business educator and university professor
- Klauser, Hans Peter (1910–1989), Swiss photographer
- Klauser, Herbert (1916–2009), Austrian writer
- Kläuser, Horst (* 1956), German journalist and moderator
- Klauser, Johann Josef (1705–1771), Bohemian archivist, court printer and owner of a private library
- Klauser, Markus (* 1958), Swiss chess player
- Klauser, Robert (1867–1951), District Administrator
- Klauser, Samuel Tobias (* 1982), Swiss actor and musical artist
- Klauser, Theodor (1894–1984), German Catholic theologian, liturgical historian, church historian and Christian archaeologist
- Klauser, Thomas (* 1964), German ski jumper
- Klausewitz, Wolfgang (1922–2018), German marine zoologist, museologist and science historian
- Klaushofer, Roswitha (* 1954), Austrian writer
- Klausing, Christian († 1764), organ builder
- Klausing, Friedrich (1887–1944), German lawyer and university professor
- Klausing, Friedrich Karl (1920–1944), German resistance fighter of July 20, 1944
- Klausing, Heinrich (1675–1745), German Lutheran theologian, mathematician, astronomer and polyhistor
- Klausing, Hinrich , German organ builder
- Klausing, Johann Berenhard († 1762), German organ builder
- Klausmann, Birgit (* 1956), German lexicographer and author
- Klausmann, Christina (1957–2008), German historian, publicist and curator
- Klausmann, Marcus (* 1977), German mountain bike rider
- Klausmann, Rainer (* 1949), Swiss cameraman
- Klausmann, Robert (1896–1972), German political activist (KPD) and resistance fighter
- Klausmann, Sigrid (* 1955), German director and screenwriter
- Klausmann, Urban (* 1952), German soccer player
- Klausmeier, Axel (* 1965), German art and architecture historian
- Klausmeier, Friedrich (* 1915), German music teacher and musicologist
- Klausner, Abraham (1915–2007), reform Jewish rabbi, military rabbi and captain in the United States Army
- Klausner, Gertrud (1877–1939), German politician
- Klausner, Hubert (1892–1939), Austrian politician (NSDAP), MdR, Gauleiter and governor of Carinthia
- Klausner, Joseph (1874–1958), Israeli literary scholar, historian and religious scholar
- Klausner, Margot (1905–1975), Israeli writer, publisher, chairwoman of the Parapsychological Society in Israel, pioneer of Israeli film and theater
- Klausner, Richard D. (* 1951), American cell biologist and biotechnology entrepreneur
- Klausner, Sabine (* 1977), Austrian politician (SPÖ), member of the state parliament
- Klausner, Uwe (* 1956), German high school teacher and crime writer
- Klausner, Wolfgang (1906–1958), German politician (BVP, NSDAP, CSU). Member of the Bundestag
- Klausner-Cronheim, Irma (1874–1959), German doctor, one of the first women to study in Germany
- Klausnitzer, Bernhard (* 1939), German entomologist and editor
- Klausnitzer, Erich (1902–1993), German teacher, benefactor researcher, writer and painter
- Klausnitzer, Isabella (* 1957), Austrian columnist and journalist
- Klausnitzer, Rudolf (* 1948), Austrian director, media journalist and cultural manager
- Klausnitzer, Ulrich (* 1963), German natural scientist
- Klausnitzer, Wolfgang (* 1950), German Catholic fundamental theologian
- Klauson, Valter (1914–1988), Estonian communist politician
- Klausová, Livia (* 1943), Czech economist
- Klauss (* 1997), Brazilian-Italian soccer player
- Klauss, Gauthier (* 1987), French canoeist
- Klauß, Gerhard (* 1944), German circus director (GDR)
- Klauß, Jürgen Karl (1944–2009), German director, author, producer and actor
- Klauß, Max (* 1947), German athlete and Olympic participant
- Klauß, Michael (* 1970), German soccer player
- Klauß, Michael (* 1987), German soccer player
- Klauß, Robert (* 1984), German soccer player and coach
- Klauß, Theo (* 1949), German university professor for education
- Klaußner, Bernd (* 1940), German scientist and politician (CDU), Member of the Bundestag, Member of the Bundestag
- Klaußner, Burghart (* 1949), German actor
- Klaußner, Dieter (* 1938), German soccer player
- Klaußner, Georg (1882–1936), German farmer, trade unionist and politician (USPD, SPD), MdL
- Klaußner, Johannes (* 1985), German actor
- Klaußner, Wolf (1930–2005), German writer
- Klaustermeyer, Heinrich (1914–1976), German police officer during the Nazi era
- Klausz, László (* 1971), Hungarian football player
- Klautendorffer, Paulus († 1566), German hymn poet
- Klautke, Gunther (* 1966), German radiation therapy oncologist
- Klautzer, Franz (1910–1971), Austrian publisher and politician (VdU), member of the National Council
- Klautzsch, Franz , German soccer player
- Klauwell, Otto (1851-1917), German composer
- Klauz, László (1961–2013), Hungarian wrestler
Klav
- Kļava, Oskars (* 1983), Latvian football player
- Klavan, Andrew (* 1954), American writer and screenwriter
- Klavan, Dzintar (* 1961), Estonian football player
- Klavan, Ragnar (* 1985), Estonian football player
- Klävemann, Carl (1816–1872), German businessman and founder
- Klävemann, Dietrich (1814–1889), German administrative lawyer and member of parliament in Oldenburg
- Klaveno, Mariana (* 1979), American actress
- Klaver, Jesse (* 1986), Dutch politician for the GroenLinks party
- Klaver, Lieke (* 1998), Dutch sprinter
- Klaver, Melody (* 1990), Dutch actress
- Klaveren, Bep van (1907–1992), Dutch boxer
- Klavins, David (* 1954), German-Latvian piano maker
Klaw
- Klaw, Irving (1910–1966), American photographer
- Klawa-Morf, Anny (1894–1993), Swiss socialist women's rights activist
- Klawe, Maria (* 1951), American computer scientist, mathematician and university lecturer
- Klawe, Willy (* 1951), German sociologist
- Klawitter, Arnd (* 1968), German film, television and theater actor
- Klawitter, Carl Louis (1869–1953), German bookseller and politician (SPD)
- Klawitter, Carl William (1856–1929), shipyard owner
- Klawitter, Fritz (1866–1942), German shipbuilding engineer and shipyard owner
- Klawitter, Gertraud , German actress and voice actress
- Klawonn, Frank (* 1964), German mathematician and computer scientist
- Klawonn, Frank (* 1966), German Olympic champion in rowing
- Klaws, Alexander (* 1983), German pop singer and musical performer
- Klawun, Anja (* 1975), German actress
- Klawunde, Doris (* 1958), German politician (Bündnis 90 / Die Grünen), deputy president of the Hanover region
Klay
- Kläy, Greti (1930–2015), Swiss film director, costume designer and art weaver
- Klay, Kurt (1914–1991), German politician (SPD), MdL
- Klay, Phil (* 1983), American writer
- Kläy, Reto (* 1978), Swiss ice hockey player and official
- Kläy, Thomas , Swiss curler
- Klayman, Alison (* 1984), American documentary filmmaker and journalist
- Klayman, Larry (* 1951), American conservative lawyer and right-wing extremist politician
- Klayman, Yarden (* 1993), Israeli saxophonist
- Klayndl, Mathes , Austrian master stonemason