Crnoja families are Croats and they are mostly from middle Bosnia. According to some sources they are from Montenegro. In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Jajce area) and in Bosnian Krajina (Mrkonjic Grad area). In places Karići and Barevo in Middle Bosnia every sixth inhabitant had the family name Crnoja.
Prevalence
About 420 people with faimily name Crnoja live in Croatia today, in 150 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 31 cities and 49 other places, mostly in Zagreb (60), Dugo Selo (20), Kutina (20), Cepin in Osijek area (15), and in Djakovo (15).
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.