Duk families are Croats the family name originates from Zabok area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zabok area.
Prevalence
About 110 people with faimily name Duk live in Croatia today, in 50 households. There were 130 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 9 Croatian counties, in 9 cities and 11 other places, mostly in Zagreb (30), Palesnik in Garesnica area (10), Vizovlje in Zabok area (10), Kutina (<10), and in Karlovac (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1926 in source Emigration Commission Zagreb.