Vretenar families are Croats and they are mostly from Pazin area (Klesari). In the past century, relatively most of Croatian residents bearing this family name were born in Pazin area and in Pula. In Jakomići in Pazin area every fourth inhabitant had the family name Vretenar.
Prevalence
About 250 people with faimily name Vretenar live in Croatia today, in 100 households. There were 210 of them in the middle of the past century, and their number increased by 20 percent. They are located in 7 Croatian counties, in 13 cities and 20 other places, mostly in Pula (35), Pazurovec in Zlatar area (15), Zagreb (15), Rijeka (15), and in Gracisce in Pazin area (15).
Outside Croatia
Family name Vretenar is present in 8 countries on three continents. The family name "Vretenar " is used by small number of people in the United States and small number in Canada.
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.