Guja families are almost entirely Croats and they are mostly from western Bosnia , rarely Hungarians (from Vukovar ). In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Livno area) and in Vukovar.
Prevalence
About 120 people with faimily name Guja live in Croatia today, in 40 households. There were 20 of them in the middle of the past century, and their number multiplied. They are located in 8 Croatian counties, in 11 cities and 9 other places, mostly in Sesvete (60), Dugo Selo (15), Zagreb (10), Vukovar (10), and in Brnaze (<10).