Koljanin families are often Croats and they are mostly from Sinj area. According to some sources they are from Finske, rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj area and in Osijek.
Prevalence
About 150 people with faimily name Koljanin live in Croatia today, in 70 households. There were 110 of them in the middle of the past century, and their number increased by 30 percent. They are located in the most of Croatian counties, in 12 cities and 8 other places, mostly in Split (70), Rijeka (25), Osijek (20), Zagreb (10), and in Pula (<10).
Outside Croatia
Family name Koljanin is present in 12 countries on four continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.