Tenacious

Hartnack is the family name of the following people:

• Daniel Hartnack (1642–1708), German Protestant theologian
• Edmund Hartnack (1826-1891), German optician
• Heinz Hartnack (1929–1990), German politician (CDU) and Member of the Bundestag (1972)
• Karl Hartnack (1864–1946), German educator, local researcher and author
• Wilhelm Hartnack (1893–1963), German geologist and university professor

See also:

• Obstinate

This is a disambiguation page for differentiating between several terms identified with the same word.