Črnjak families are Croats and they are mostly from Velika Gorica. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Velika Gorica.
Prevalence
About 90 people with faimily name Črnjak live in Croatia today, in 40 households. There were 200 of them in the middle of the past century, and their number halved. They are located in 6 Croatian counties, in 10 cities and 10 other places, mostly in Zagreb (35), Velika Gorica (20), Bolc in Cazma area (<10), Gacice (<10), and in Mostari in Vrbovec area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.