In Croatia, Budaj families are almost entirely Croats (from Djurdjevac area ), barely Serbs, and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Pozega.
Prevalence
About 50 people with faimily name Budaj live in Croatia today, in 20 households. There were 90 of them in the middle of the past century, and their number decreased by 40 percent. They are only located in in 7 Croatian cities and 9 other places, mostly in Zagreb (<10), Kuzminec in Koprivnica area (<10), Pozega (<10), Rijeka (<10), and in Zapresic (<10).
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.