Šivak families are Croats and they are mostly from Klanjec area. According to some sources they originate from Czechia. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Klanjec area. In Pušća in Klanjec area every fourth inhabitant had the family name Šivak.
Prevalence
About 230 people with faimily name Šivak live in Croatia today, in 110 households. There were 320 of them in the middle of the past century, and their number decreased by 30 percent. They are located in the most of Croatian counties, in 14 cities and 30 other places, mostly in Zagreb (85), Demerje (20), Pusca in Klanjec area (15), Kutina (15), and in Zupanja (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.