Erdeljac families are Croats and they are mostly from Ogulin area. In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and in Ogulin area. In Srednje Prilišće in Duga Resa area every fifth inhabitant had the family name Erdeljac.
Prevalence
About 150 people with faimily name Erdeljac live in Croatia today, in 80 households. There were 270 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 6 Croatian counties, in 8 cities and 18 other places, mostly in Karlovac (45), Zagreb (30), Generalski Stol in Ogulin area (15), Duga Resa (15), and in Koprivnica (<10).
Outside Croatia
At least four families with this surname emigrated from Croatia to the United States (3) and Australia (1). Family name Erdeljac is present in 9 countries on three continents. The family name "Erdeljac " is used by some 200 people in the United States , small number in Canada , and small number of people in Australia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.