Ćošković families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Bosanski Samac area) and in Zupanja area.
Prevalence
About 70 people with faimily name Ćošković live in Croatia today, in 40 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in 7 Croatian counties, in 12 cities and 9 other places, mostly in Babina Greda in Zupanja area (15), Stitar (15), Zagreb (15), Podgora in Makarska area (<10), and in Slavonski Samac in Zupanja area (<10).
Outside Croatia
Family name Ćošković is present in three countries.
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.