Sirovec families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Koprivnica. In Švaljkovec in Zabok area every fourth inhabitant had the family name Sirovec.
Prevalence
About 260 people with faimily name Sirovec live in Croatia today, in 110 households. There were 240 of them in the middle of the past century, and their number increased by 10 percent. They are located in 7 Croatian counties, in 16 cities and 28 other places, mostly in Zagreb (70), Svaljkovec in Zabok area (30), Koprivnica (25), Josipovac (25), and in Vidovec in Varazdin area (10).
Outside Croatia
At least two families with this surname emigrated from Croatia to the United States. Family name Sirovec (including: Syrovec , Sirovetz ) is present in 8 countries on three continents. "Sirovetz " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.