In Croatia, Banja families are generally Croats (from Virovitica ), very rarely Bosniaks (from Ploce ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Virovitica and Grubisno Polje.
Prevalence
About 40 people with faimily name Banja live in Croatia today, in 17 households. There were 40 of them in the middle of the past century, and their number remains constant. They are located in 8 Croatian counties, in 7 cities and 5 other places, mostly in Rezovac (15), Veliki Grdjevac in Grubisno Polje area (<10), Grbavac (<10), Osijek (<10), and in Virovitica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.