In Croatia, Rudnik families are predominantly Croats (from Slavonski Brod area ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod and in Pleternica area.
Prevalence
About 20 people with faimily name Rudnik live in Croatia today, in 6 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in only threee Croatian places: in Zagreb (<5), and in Slobodnica (<5) and Zavrsje (<5) in Slavonski Brod area.