In Croatia, Rustinjac families are mainly Serbs, equally Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area and in Zagreb.
Prevalence
Only a few people with faimily name Rustinjac live in Croatia today, in two households only. There were 20 of them in the middle of the past century, and their number halved. They are located in only four naselja i to in Zagreb (<5), Sesvete (<5), Hrvatska Kostajnica (<5), and in Zivaja in Hrvatska Kostajnica area (<5).
Outside Croatia
Family name Rustinjac is present in three countries on two continents. The family name "Rustinjac " is used by few people in the United States.