In Croatia, Kosorčić families are Croats (from Vrlika ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Vrlika. In Rudenice in Cazins Region (Bosnia) nearly every inhabitant had the family name Kosorčić.
Prevalence
About 40 people with faimily name Kosorčić live in Croatia today, in 15 households. There were 30 of them in the middle of the past century, and their number increased by 30 percent. They are located in threee Croatian counties, four cities and two other places, mostly in Zagreb (20), Kosore (10), Rijeka (<10), Split (<5), and in Vrlika (<5).
Outside Croatia
Family name Kosorčić is present in three countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.