Rušnjak families are Croats and they are mostly from Buzet. In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia and in Buzet. In Cancini in Porec every fourth inhabitant had the family name Rušnjak.
Prevalence
About 150 people with faimily name Rušnjak live in Croatia today, in 60 households. There were 120 of them in the middle of the past century, and their number increased by 20 percent. They are located in 9 Croatian counties, in 14 cities and 23 other places, mostly in Zagreb (15), Cancini (15), Pula (15), Pracana (10), and in Trnovec in Cakovec area (<10).
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.