In Croatia, Čelko families are Croats (from Sveti Ivan Zelina ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sveti Ivan Zelina.
Prevalence
About 20 people with faimily name Čelko live in Croatia today, in 8 households. There were 30 of them in the middle of the past century, and their number decreased by 30 percent. They are located in only threee naselja i to in Sveti Ivan Zelina (15), Blazevdol (<10), and in Zagreb (<5).