Petras families are Croats and they are mostly from Djurdjevac area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Djurdjevac area.
Prevalence
About 160 people with faimily name Petras live in Croatia today, in 70 households. There were 310 of them in the middle of the past century, and their number halved. They are located in 7 Croatian counties, in 8 cities and 17 other places, mostly in Novigrad Podravski in Djurdjevac area (20), Glavnicica (20), Vukovina (20), Lijeva Luka in Sisak area (15), and in Zagreb (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.