Ćoso families are mainly Croats and they are mostly from Zadar area , often Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Benkovac and Zadar. In Gornja Jagodnja in Benkovac area every fifth inhabitant had the family name Ćoso.
Prevalence
About 260 people with faimily name Ćoso live in Croatia today, in 120 households. There were 80 of them in the middle of the past century, and their number tripled. They are located in the most of Croatian counties, in 25 cities and 28 other places, mostly in Zadar (30), Rijeka (30), Zagreb (25), Omis (20), and in Split (15).
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.