In Croatia, Bolonja families are Croats (from Nin area ). In the past century, relatively most of Croatian residents bearing this family name were born in Nin area and in Zadar.
Prevalence
About 50 people with faimily name Bolonja live in Croatia today, in 20 households. There were 20 of them in the middle of the past century, and their number more than doubled. They are located in only threee naselja i to in Radovin in Nin area (40), Zadar (10), and in Rijeka (<5).