In Croatia, Kasak families are predominantly Croats (from Djakovo area ), rarely Slovaks (from Osijek area ). In the past century, relatively most of Croatian residents bearing this family name were born in Nasice and Osijek.
Prevalence
About 30 people with faimily name Kasak live in Croatia today, in 16 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties and four other places, mostly in Osijek (10), Dugo Selo (<10), Djakovo (<5), Gorjani in Djakovo area (<5), and in Donje Psarjevo (<5).