In Croatia, Ćos families are Croats (from Ozalj ). In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Ozalj.
Prevalence
Only a few people with faimily name Ćos live in Croatia today, in three households only. They are located in only threee naselja i to in Gornje Pokupje (<5), Mahicno (<5), and in Jugovac in Ozalj area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1924 in source Emigration Commission Zagreb.