In Croatia, Petrošić families are Croats (from Cazma ). In the past century, relatively most of Croatian residents bearing this family name were born in Split and Bjelovar.
Prevalence
About 30 people with faimily name Petrošić live in Croatia today, in 11 households. There were 40 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 6 Croatian counties, in 7 cities, mostly in Split (15), Pobjenik (10), Zapresic (<5), Rijeka (<5), and in Bjelovar (<5).
Outside Croatia
Family name Petrošić is present in three countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.