In Croatia, Ilija families are predominantly Croats (from Donji Miholjac area ), rarely Roms (from Dugo Selo ), and very rarely Romanians (from Velika Gorica ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and in Donji Miholjac area.
Prevalence
About 20 people with faimily name Ilija live in Croatia today, in 8 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties, in 6 cities and another small place , mostly in Zagreb (<10), Osijek (<5), Belisce (<5), Valpovo (<5), and in Karlovac (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1927 in source Emigration Commission Zagreb.