Žiljak families are Croats and they are mostly from Oroslavje area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Oroslavje area.
Prevalence
About 170 people with faimily name Žiljak live in Croatia today, in 80 households. There were 220 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 7 Croatian counties, in 10 cities and 12 other places, mostly in Zagreb (50), in Gornja Bistra (35), Donja Bistra (15) and Oborovo Bistransko (<10) in Oroslavje area, and in Zapresic (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.