In Croatia, Sivac families are predominantly Croats (from Dugo Selo ), rarely Bosniaks (from Bosnian Krajina ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sisak.
Prevalence
About 50 people with faimily name Sivac live in Croatia today, in 18 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in 6 Croatian counties, in 6 cities and 6 other places, mostly in Zagreb (15), Sisak (<10), Dugo Selo (<10), Ivanja Reka (<10), and in Kolocep (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.