In Croatia, Firbus families are Croats (from Rijeka area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka.
Prevalence
Only a few people with faimily name Firbus live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Rijeka (<5) and Ratulje in Rijeka area (<5).
Outside Croatia
Family name Firbus is present in this form only in Croatia.