Sovilj families are mainly Serbs and they are mostly from Knin area , whereas often Croats (also 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 places Gubavčevo Polje and Kijani in Knin area every sixth inhabitant had the family name Sovilj.
Prevalence
About 110 people with faimily name Sovilj live in Croatia today, in 70 households. There were 200 of them in the middle of the past century, and their number decreased by 40 percent. They are located in the most of Croatian counties, in 15 cities and 20 other places, mostly in Zagreb (35), in Gracac (10) and Kijani (10) in Knin area, Rijeka (<10), and in Daruvar (<10).
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.