In Croatia, Birkaš families are Croats (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo area and in Djakovo.
Prevalence
About 10 people with faimily name Birkaš live in Croatia today, in two households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, in one city and another small place , mostly in Pula (<10) and Drenje in Djakovo area (<5).