Ravnjak families are Croats and they are mostly from middle Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Odzak area) and in Bosanian Posavina (Modrica area). In Babešnica in Bosanian Posavina every sixth inhabitant had the family name Ravnjak.
Prevalence
About 280 people with faimily name Ravnjak live in Croatia today, in 110 households. There were 20 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 18 cities and 31 other places, mostly in Zagreb (50), Semeljci in Djakovo area (40), Slavonski Brod (35), Osijek (15), and in Koprivnica (15).
Outside Croatia
Family name Ravnjak is present in 13 countries on three 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.