In Croatia, Demonja families are predominantly Serbs, rarely Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Glina and Zagreb. In Vlahović in Glina every sixth inhabitant had the family name Demonja.
Prevalence
About 30 people with faimily name Demonja live in Croatia today, in 16 households. There were 120 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian counties and four other places, mostly in Zagreb (<10), Vlahovic (<10), Ravno Rasce (<10), Sisak (<5), and in Fazana (<5).