In Croatia, Hrastnik families are generally Croats (from Kutina ), barely Czechs (also from Kutina ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Kutina and Zagreb.
Prevalence
About 60 people with faimily name Hrastnik live in Croatia today, in 30 households. There were 40 of them in the middle of the past century, and their number increased by 30 percent. They are located in 6 Croatian counties and 7 other places, mostly in Kutina (25), Zagreb (10), Labin (10), Vinez (<10), and in Samobor (<5).
Outside Croatia
Family name Hrastnik is present in 15 countries worldwide.