In Croatia, Dubraja families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
About 10 people with faimily name Dubraja live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number halved. They are located in one Croatian city only, in Zagreb (10).
Outside Croatia
Family name Dubraja is present in three countries on two continents. The family name "Dubraja " is used by few people in the United States.