In Croatia, Erdelyi families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
Only a few people with faimily name Erdelyi live in Croatia today, in two households only. They are located in one Croatian city only, in Zagreb (<5).
Outside Croatia
Family name Erdelyi is present in 36 countries worldwide. The family name "Erdelyi " is used by some 1000 people in Hungary , about 400 in the United States , and some 200 people in Germany.
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.