In Croatia, Udjbinac families are generally Croats (from Grubisno Polje area ), rarely Slovenes (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Grubisno Polje area and in Bjelovar.
Prevalence
About 10 people with faimily name Udjbinac live in Croatia today, in 6 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only five naselja i to in Zagreb (<10), Virovitica (<5), Kapelica (<5), Sisljavic (<5), and in Domankus in Bjelovar area (<5).
Outside Croatia
Family name Udjbinac is present in this form only in Croatia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.