In Croatia, Kovaljski families are Croats (from Pleternica ). In the past century, relatively most of Croatian residents bearing this family name were born in Pleternica.
Prevalence
Only a few people with faimily name Kovaljski live in Croatia today, in one household only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only one small Croatian place, in Frkljevci (<10).