Radas families are Croats and they are mostly from Knin area. In the past century, relatively most of Croatian residents bearing this family name were born in Knin area and in Zagreb. In Mratovo in Knin area every sixth inhabitant had the family name Radas.
Prevalence
About 200 people with faimily name Radas live in Croatia today, in 90 households. There were 100 of them in the middle of the past century, and their number doubled. They are located in the most of Croatian counties, in 20 cities and 8 other places, mostly in Zagreb (65), Split (35), Biograd na moru (25), Zadar (20), and in Vodice (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.