Dugač families are Croats and they are mostly from Hrvatska Kostajnica area. In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area and in Sisak.
Prevalence
About 70 people with faimily name Dugač live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number remains constant. They are located in 6 Croatian counties, in 6 cities and 5 other places, mostly in Zagreb (15), Sisak (10), in Sunja (<10) and Greda Sunjska (<10) in Hrvatska Kostajnica area, and in Gornja Petricka in Bjelovar area (<10).
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.