Bumbak families are Croats and they are mostly from Sibenik. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Vodice.
Prevalence
About 180 people with faimily name Bumbak live in Croatia today, in 80 households. There were 150 of them in the middle of the past century, and their number increased by 20 percent. They are located in 8 Croatian counties, in 12 cities and 9 other places, mostly in Sibenik (75), Jadrtovac (30), Split (15), Zagreb (15), and in Prvic Luka (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.