In Croatia, Grošek families are Croats (from Zlatar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zlatar area.
Prevalence
About 30 people with faimily name Grošek live in Croatia today, in 12 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties, threee cities and 5 other places, mostly in Zagreb (<10), Zapresic (<10), Starigrad (<10), Turnisce in Zlatar area (<10), and in Koprivnica (<5).