Dergez families are Croats and they are mostly from Djurdjevac area. In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac area and in Osijek.
Prevalence
About 80 people with faimily name Dergez live in Croatia today, in 30 households. There were 50 of them in the middle of the past century, and their number increased by 60 percent. They are only located in in 6 Croatian cities and 7 other places, mostly in Podravske Sesvete in Djurdjevac area (35), Josipovac (10), Bjelovar (<10), Djurdjevac (<10), and in Sandrovac in Bjelovar area (<10).
Outside Croatia
Family name Dergez is present in five countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.