In Croatia, Slemenšek families are Croats (from Novigrad ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sisak.
Prevalence
About 10 people with faimily name Slemenšek live in Croatia today, in five households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in four Croatian cities only: in Zagreb (<10), Kutina (<5), Breznik Plesivicki (<5), and in Novigrad (<5).
Outside Croatia
Family name Slemenšek is present in this form only in Croatia.