In Croatia, Riljko families are Croats (from Djurdjevac area ). In the past century, relatively most of Croatian residents bearing this family name were born in Virovitica and in Djurdjevac area.
Prevalence
About 10 people with faimily name Riljko live in Croatia today, in one household only. They are located in only two Croatian places: in Velika Cresnjevica (10) and Pitomaca (<5) in Djurdjevac area.
Outside Croatia
Family name Riljko is present in this form only in Croatia.