Črnac families are Croats and they are mostly from Buzet area. According to some sources vuku korijene from Czechia, odnosno Germany. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Buzet area. In Račja Vas in Buzet area every third inhabitant had the family name Črnac.
Prevalence
About 110 people with faimily name Črnac live in Croatia today, in 50 households. There were 40 of them in the middle of the past century, and their number more than doubled. They are located in threee Croatian counties, in 8 cities and 13 other places, mostly in Rijeka (30), Buzet (15), Rovinj (15), Pula (<10), and in Medulin in Pula area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.