Dužaić families are Croats and they are mostly from Sveti Ivan Zelina. In the past century, relatively most of Croatian residents bearing this family name were born in Sveti Ivan Zelina and Zagreb. In Tomaševec in Sveti Ivan Zelina every third inhabitant had the family name Dužaić.
Prevalence
About 80 people with faimily name Dužaić live in Croatia today, in 30 households. There were 100 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 6 Croatian counties, four cities and 12 other places, mostly in Tomasevec (35), Zagreb (10), Sveti Ivan Zelina (<10), Pula (<10), and in Velika Gorica (<10).
Outside Croatia
Family name Dužaić is present in this form only in Croatia.
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.