In Croatia, Dugac families are generally Croats (from Vrbovec ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Vrbovec. In Žunci in Vrbovec every tenth inhabitant had the family name Dugac.
Prevalence
About 60 people with faimily name Dugac live in Croatia today, in 20 households. There were 70 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 6 Croatian counties, in 6 cities and 8 other places, mostly in Zunci (20), Zagreb (<10), Osijek (<10), Sesvete (<10), and in Vrbovec (<10).
Outside Croatia
Family name Dugac is present in 7 countries worldwide. "Dugach " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.