In Croatia, Koščić families are Croats (from Middle Bosnia ). In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Kakanj area) and in Rijeka. In Crnac in Western Bosnia every eighth inhabitant had the family name Koščić.
Prevalence
About 60 people with faimily name Koščić live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 8 Croatian counties, in 8 cities and 11 other places, mostly in Zagreb (15), Rijeka (<10), Jaguplije in Pozega area (<10), Vinkovci (<5), and in Crikvenica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1923 in source Emigration Commission Zagreb.