The surname Crnjak is among thousand most common family names in Croatia. Today in Croatia, there are more then eight hundred people called Crnjak. Many of them are living in the following places: Zagreb - 20%, Vinkovci - 6%, Sesvete (Zagreb) - 5%, Rijeka - 4%, Šibenik - 4%. Taking into account the population density, most people who have the surname Crnjak are living in: Podgradina (Slivno) - 1. most common family name in the place, Babotok (Kapela) - 3. most common family name in the place, Donji Mosti (Kapela) - 5. most common family name in the place.
Slavko Crnjak, gospodarstvenik (1921), Dubravko Crnjak, znanstvenik (1937), Mladen Crnjak, gospodarstvenik (1940), Marijana Crnjak-Habek, ekonomistica (1947), Mario Crnjak, inženjer i gospodarstvenik (1949), Biljana Crnjak-Karanović, ekonomistica i znanstvenica (1954), Petar Crnjak, inženjer i gospodarstvenik (1959), Jelenko Crnjak, inženjer (1965).