In Croatia, Grudaj families are Albanians (from Buje ). In the past century, relatively most of Croatian residents bearing this family name were born in Backa, Vojvodina and in Slovenia.
Prevalence
Only a few people with faimily name Grudaj live in Croatia today, in two households only. They are located in only one small Croatian place, in Krsete (<5).
Outside Croatia
Family name Grudaj (including: Gruday , Grudai ) is present in four countries.