Sivec families are Croats and they are mostly from Klanjec area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zlatar area. In Lipnica Zagorska in Klanjec area every fifth inhabitant had the family name Sivec.
Prevalence
About 90 people with faimily name Sivec live in Croatia today, in 40 households. There were 120 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 8 Croatian counties, in 10 cities and 13 other places, mostly in Zagreb (35), Grtovec in Zlatar area (10), Zabok (<10), Zapresic (<10), and in Brodjanci in Valpovo area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1938 in source Emigration Commission Zagreb.