In Croatia, Birko families are Croats (from Krizevci area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Bjelovar.
Prevalence
About 50 people with faimily name Birko live in Croatia today, in 19 households. There were 40 of them in the middle of the past century, and their number increased by 20 percent. They are located in 6 Croatian counties, in 7 cities and 7 other places, mostly in Zagreb (15), Vrbovec (<10), Dugo Selo (<5), Veliki Brezovec in Vrbovec area (<5), and in Novi Glog in Krizevci area (<5).
