In Croatia, Frštek families are Croats (from Sisak area ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak area and in Bjelovar. In Desni Dubrovčak in Sisak area every fifth inhabitant had the family name Frštek.
Prevalence
About 30 people with faimily name Frštek live in Croatia today, in 12 households. There were 60 of them in the middle of the past century, and their number halved. They are located and 6 other Croatian places, mostly in Desni Dubrovcak in Sisak area (10), Posavski Bregi (<10), Ivanic-Grad (<10), Cazma (<5), and in Zagreb (<5).
Outside Croatia
Family name Frštek (including: Frstek , Ferstek ) is present in three countries.