In Croatia, Duga families are almost entirely Croats (from Djurdjevac area ), very rarely Slovenes (also from Djurdjevac area ). In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac area and in Koprivnica.
Prevalence
About 30 people with faimily name Duga live in Croatia today, in 11 households. There were 40 of them in the middle of the past century, and their number decreased by 20 percent. They are located in only five naselja i to in Novigrad Podravski in Djurdjevac area (20), Zagreb (<10), Ivanic-Grad (<5), Virje in Djurdjevac area (<5), and in Prigorje Brdovecko in Zapresic area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.