In Croatia, Kosta families are Croats (from Rijeka area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka.
Prevalence
Only a few people with faimily name Kosta live in Croatia today, in three households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Mavrinci in Rijeka area (<10) and Rijeka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1925 in source Emigration Commission Zagreb.