Kotromanović families are Croats and they are mostly from Bosnian Krajina. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj and in Sinj area.
Prevalence
About 120 people with faimily name Kotromanović live in Croatia today, in 40 households. There were 60 of them in the middle of the past century, and their number doubled. They are located in the most of Croatian counties, in 16 cities and 8 other places, mostly in Potravlje in Sinj area (25), Osijek (20), Fericanci in Orahovica area (15), Brnaze (15), and in Beli Manastir (<10).
Outside Croatia
Family name Kotromanović is present in three countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.