In Croatia, Petar families are almost entirely Croats (from Zagreb ), barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Kutina.
Prevalence
About 50 people with faimily name Petar live in Croatia today, in 18 households. There were 80 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 7 Croatian counties, in 9 cities and threee other places, mostly in Zagreb (55), Osijek (<5), Cepin in Osijek area (<5), Rijeka (<5), and in Koprivnica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1749 in source 18th Century Census.