In Croatia, Čefko families are almost entirely Croats (from Zlatar area ), barely Slovenes (from Zagreb ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zlatar area and in Zagreb.
Prevalence
About 50 people with faimily name Čefko live in Croatia today, in 18 households. There were 30 of them in the middle of the past century, and their number increased by 40 percent. They are located in four Croatian counties, threee cities and four other places, mostly in Zagreb (30), Tugonica in Zlatar area (<10), Veleskovec in Oroslavje area (<10), Visnjevac (<5), and in Zabok (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.