In Croatia, Klasni families are predominantly Croats (from Ilok ), rarely Slovaks (also from Ilok ). In the past century, relatively most of Croatian residents bearing this family name were born in Ilok and in Backa, Vojvodina.
Prevalence
Only a few people with faimily name Klasni live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only two Croatian places: in Ilok (<10) and Miklusevci in Ilok area (<5).