In Croatia, Blaca families are Croats by relative majority (from Zagreb ), rarely Serbs, and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Serbia.
Prevalence
Only a few people with faimily name Blaca live in Croatia today, in one household only. They are located in only two Croatian places: in Zagreb (<10) and Stivica in Nova Gradiska area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.