In Croatia, Kos-Perko families are Croats (from Sveti Ivan Zelina ). In the past century, relatively most of Croatian residents bearing this family name were born in Sveti Ivan Zelina.
Prevalence
About 10 people with faimily name Kos-Perko live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number halved. They are located in only four Croatian places: in Donja Zelina (<10), Blaskovec (<5), Moravce (<5), and in Hrnjanec (<5).
Outside Croatia
Family name Kos-Perko is present in this form only in Croatia.
