In Croatia, Erdelj families are almost entirely Croats (from Kutina area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Kutina area and in Bosnian Krajina (Teslic area).
Prevalence
About 30 people with faimily name Erdelj live in Croatia today, in 10 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties, threee cities and 8 other places, mostly in Zagreb (<10), Podbrdje in Kutina area (<10), Kletiste (<10), Karlovac (<5), and in Popovaca in Kutina area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.