In Croatia, Rilak families are mainly Croats (from Pula ), less frequently Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in East Herzegovina (Bileca area) and in Serbia.
Prevalence
About 10 people with faimily name Rilak live in Croatia today, in five households only. They are located in threee Croatian counties and another small place , mostly in Pazin (<5), Split (<5), Pula (<5), Rovinj (<5), and in Mali Losinj on the Island of Losinj (<5).