In Croatia, Černok families are almost entirely Croats (from Vukovar ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Vukovar and Zagreb.
Prevalence
About 30 people with faimily name Černok live in Croatia today, in 15 households. There were 10 of them in the middle of the past century, and their number tripled. They are located in 6 Croatian counties and four other places, mostly in Vukovar (10), Zagreb (<5), Osijek (<5), Karlovac (<5), and in Ledenice (<5).