In Croatia, Kolaček families are mainly Croats (from Daruvar area ), less frequently Czechs (from Daruvar ), and barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Daruvar and Zagreb.
Prevalence
About 60 people with faimily name Kolaček live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number increased by 10 percent. They are located in threee Croatian counties, four cities and 6 other places, mostly in Zagreb (15), Daruvar (15), Borova Kosa in Daruvar area (10), Bjelovar (<5), and in Slavonski Brod (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.