Zavrtnik families are Croats and they are mostly from Varazdin area. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and in Varazdin area. In places Zamlača and Cargovec in Varazdin area every ninth inhabitant had the family name Zavrtnik.
Prevalence
About 140 people with faimily name Zavrtnik live in Croatia today, in 50 households. There were 100 of them in the middle of the past century, and their number increased by 40 percent. They are located in 8 Croatian counties, in 6 cities and 14 other places, mostly in Varazdin (30), Zagreb (15), and in Vidovec (15), Cargovec (15) and Zamlaca (10) in Varazdin area.
Outside Croatia
Family name Zavrtnik is present in four countries on two continents. "Zavertnik " is used by some 200 people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.