In Croatia, Rojka families are predominantly Croats (from Vinkovci area ), rarely Slovaks (from Srijem, Vojvodina ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Vinkovci area.
Prevalence
About 20 people with faimily name Rojka live in Croatia today, in four households only. They are located in only four Croatian places: in Djeletovci in Vinkovci area (10), Soljani in Zupanja area (<10), Ilok (<5), and in Zagreb (<5).