Roško families are Croats and they are mostly from Skradin. In the past century, relatively most of Croatian residents bearing this family name were born in Skradin and Sibenik. In Sonković in Skradin every tenth inhabitant had the family name Roško.
Prevalence
About 140 people with faimily name Roško live in Croatia today, in 60 households. There were 30 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 15 cities and 11 other places, mostly in Sibenik (30), Trnovec in Varazdin area (25), Zagreb (20), Sonkovic (<10), and in Split (<5).
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.