Radusin families are mainly Serbs and they are mostly from Knin area , whereas often Croats (from Zupanja area ). In the past century, relatively most of Croatian residents bearing this family name were born in Knin area and in Zupanja area. In places Vučipolje and Grab in Knin area every fifth inhabitant had the family name Radusin.
Prevalence
About 100 people with faimily name Radusin live in Croatia today, in 50 households. There were 220 of them in the middle of the past century, and their number halved. They are located in 9 Croatian counties, in 8 cities and 8 other places, mostly in Zagreb (35), in Gracac (25) and Grab (15) in Knin area, Ostrovo in Vinkovci area (<10), and in Rijeka (<5).
Outside Croatia
Family name Radusin (including: Radushin , Radhusinh ) is present in 15 countries worldwide. The family name "Radusin " is used by small number of people in Canada , small number in South Africa , and small number of 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 2007 in source Encyclopaedia of Croatian Surnames.