In Croatia, Košćina families are Croats (from Trogir ). In the past century, relatively most of Croatian residents bearing this family name were born in Trogir and Split.
Prevalence
About 30 people with faimily name Košćina live in Croatia today, in 13 households. There were 50 of them in the middle of the past century, and their number decreased by 40 percent. They are located in four Croatian counties, in 6 cities and threee other places, mostly in Trogir (10), Split (<10), Zagreb (<5), Gornje Makojisce (<5), and in Solin (<5).