In Croatia, Erdelez families are generally Croats (from the Island of Murter ), barely Czechs (also from the Island of Murter ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Dubrovnik and Split.
Prevalence
About 40 people with faimily name Erdelez live in Croatia today, in 20 households. There were 40 of them in the middle of the past century, and their number remains constant. They are located in 8 Croatian counties, in 9 cities and threee other places, mostly in Sinj (<10), Dubrovnik (<10), Jezera on the Island of Murter (<10), Zagreb (<10), and in Sibenik (<5).
Outside Croatia
Family name Erdelez is present in two countries on two continents. The family name "Erdelez " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.