Bolšec families are Croats and they are mostly from Zlatar area. In the past century, relatively most of Croatian residents bearing this family name were born in Zlatar area and in Zagreb. In places Stari Golubovec and Petrova Gora in Zlatar area every twentieth inhabitant had the family name Bolšec.
Prevalence
About 150 people with faimily name Bolšec live in Croatia today, in 60 households. There were 120 of them in the middle of the past century, and their number increased by 30 percent. They are located in the most of Croatian counties, in 17 cities and 18 other places, mostly in Zagreb (45), Stari Golubovec in Zlatar area (20), Bestovje in Samobor area (15), Petrova Gora in Zlatar area (10), and in Varazdin (<10).
Outside Croatia
Family name Bolšec (including: Bolsec , Bolschetz ) is present in five countries on two continents. The family name "Bolsec " 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 few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.