In Croatia, Oros families are predominantly Croats (from Vinkovci area ), rarely Rusyns (from Ilok area ), and very rarely Hungarians (from Vinkovci area ). In the past century, relatively most of Croatian residents bearing this family name were born in Vinkovci area and in Ilok area.
Prevalence
About 60 people with faimily name Oros live in Croatia today, in 30 households. There were 100 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 8 Croatian counties, in 10 cities and 8 other places, mostly in Stari Jankovci in Vinkovci area (10), Miklusevci in Ilok area (<10), Krizevci (<10), Vukovar (<10), and in Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.