In Croatia, Kolbas families are mainly Croats (from Slavonski Brod area ), less frequently Rusyns (from Vukovar area ), and barely Ukrainians (also from Vukovar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo and Vukovar.
Prevalence
About 60 people with faimily name Kolbas live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 9 Croatian counties, in 9 cities and 6 other places, mostly in Zagreb (15), Vukovar (10), Petrovci in Vukovar area (10), Vinkovci (<5), and in Samobor (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.