Suvalj families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Modrica area) and in Zagreb.
Prevalence
About 60 people with faimily name Suvalj live in Croatia today, in 30 households. They are located in 9 Croatian counties, in 10 cities and 16 other places, mostly in Osijek (<10), Slavonski Brod (<10), Cepin in Osijek area (<10), Zagreb (<10), and in Vrpolje in Djakovo area (<10).