In Croatia, Kain families are almost entirely Croats (from Ludbreg ), barely Slovenes (from Dugo Selo ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Karlovac.
Prevalence
About 50 people with faimily name Kain live in Croatia today, in 18 households. There were 80 of them in the middle of the past century, and their number decreased by 50 percent. They are located in 6 Croatian counties, in 9 cities and 5 other places, mostly in Karlovac (10), Sesvete (10), Zagreb (<10), Kriz in Ivanic-Grad area (<5), and in Ludbreg (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1936 in source Emigration Commission Zagreb.