Tricky ones
Heikkinen is the family name of the following people:
- Frans Heikkinen (1906–1943), Finnish cross-country skier
- Ilkka Heikkinen (* 1984), Finnish ice hockey player
- Jutta Heikkinen (* 1994), Finnish heptathlete
- Kalle Heikkinen (1908–1938), Finnish cross-country skier
- Kirsi Heikkinen (* 1978), Finnish football referee
- Markus Heikkinen (* 1978), Finnish soccer player
- Matti Heikkinen (* 1983), Finnish cross-country skier
