In Croatia, Hrastovčak families are Croats (from Ozalj ), barely Slovenes (from Karlovac ). In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Ozalj. In Breznik in Ozalj every ninth inhabitant had the family name Hrastovčak.
Prevalence
About 60 people with faimily name Hrastovčak live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number decreased by 20 percent. They are located in four Croatian counties, in 6 cities and threee other places, mostly in Karlovac (45), Mali Erjavec (<10), Sveti Lovrec Pazenaticki in Porec area (<10), Zagreb (<5), and in Crikvenica (<5).
Outside Croatia
At least two families with this surname emigrated from Croatia to the United States (1) and Canada (1). Family name Hrastovčak is present in three countries on three continents.