Busak families are Croats and they are mostly from Jastrebarsko area. In the past century, relatively most of Croatian residents bearing this family name were born in Jastrebarsko area and in Zagreb.
Prevalence
About 120 people with faimily name Busak live in Croatia today, in 40 households. There were 90 of them in the middle of the past century, and their number increased by 30 percent. They are located and 19 other Croatian places, mostly in Desni Stefanki in Jastrebarsko area (30), Zagreb (20), Donji Dragonozec (<10), Crna Draga in Jastrebarsko area (<10), and in Karlovac (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.