Duka families are Croats and they are mostly from Zadar. In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and Split. In Babindub in Zadar every second inhabitant had the family name Duka.
Prevalence
About 270 people with faimily name Duka live in Croatia today, in 130 households. There were 210 of them in the middle of the past century, and their number increased by 30 percent. They are located in the most of Croatian counties, in 17 cities and 19 other places, mostly in Zadar (95), Split (70), Osijek (25), Zagreb (15), and in Porec (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 2007 in source Encyclopaedia of Croatian Surnames.