Brubnjak families are Croats and they are mostly from Opatija area. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Opatija. In Donji Kraj in Opatija area every sixth inhabitant had the family name Brubnjak.
Prevalence
About 80 people with faimily name Brubnjak live in Croatia today, in 30 households. There were 50 of them in the middle of the past century, and their number increased by 60 percent. They are located in threee Croatian counties, four cities and 14 other places, mostly in Moscenicka Draga (15) and Lovran (15) in Opatija area, Opatija (10), and in Tulisevica (<10) and Medveja (<10) in Opatija area.
Outside Croatia
Family name Brubnjak is present in five 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.