Petonjić families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Bosanska Gradiska area) and in Middle Bosnia (Jajce area).
Prevalence
About 100 people with faimily name Petonjić live in Croatia today, in 40 households. They are located in the most of Croatian counties, in 12 cities and 16 other places, mostly in Zagreb (15), Dugo Selo (15), Podgora Krapinska (<10), Novigrad Podravski in Djurdjevac area (<10), and in Velika Ostrna (<10).
Outside Croatia
Family name Petonjić is present in 7 countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.