In Croatia, Rušćić families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born on the Island of Brac.
Prevalence
Only a few people with faimily name Rušćić live in Croatia today, in one household only. They are located in two Croatian cities only, in Zagreb (<5) and Rijeka (<5).
Outside Croatia
Family name Rušćić (including: Ruscic , Ruscick ) is present in four countries on three continents. "Ruscick " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1672 in source Catholic Church Parish Records.