Dunaj families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Krapina and Zagreb. In places Brezovica Petrovska and Orehovec Radobojski in Krapina area every seventh inhabitant had the family name Dunaj.
Prevalence
About 280 people with faimily name Dunaj live in Croatia today, in 100 households. There were 190 of them in the middle of the past century, and their number increased by 50 percent. They are located in the most of Croatian counties, in 15 cities and 31 other places, mostly in Brezovica Petrovska in Krapina area (50), Zagreb (45), Orehovec Radobojski in Krapina area (25), Podgora Krapinska (20), and in Krapina (20).
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.