In Croatia, Hornjak families are predominantly Croats (from Srijem, Vojvodina ), rarely Rusyns (from Vukovar area ), and very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Srijem, Vojvodina and in Vukovar.
Prevalence
About 40 people with faimily name Hornjak live in Croatia today, in 17 households. There were 60 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 6 Croatian counties, in 6 cities and 6 other places, mostly in Osijek (<10), Vukovar (<10), Zagreb (<10), Ilok (<10), and in Visnjevac (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.