In Croatia, Cvilko families are Croats (from Krapina ). In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Krapina.
Prevalence
About 40 people with faimily name Cvilko live in Croatia today, in 15 households. There were 30 of them in the middle of the past century, and their number increased by 0 percent. They are only located in in 6 Croatian cities and 5 other places, mostly in Remetinec (15), Zagora (<10), Varazdin (<5), Podbrezovica in Krapina area (<5), and in Zagreb (<5).
Outside Croatia
Family name Cvilko is present in this form only in Croatia.