Sudan families are Croats and they are mostly from Rijeka area. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Rijeka area.
Prevalence
About 70 people with faimily name Sudan live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, threee cities and 11 other places, mostly in Drazice (15), Podhum (10) and Cavle (<10) in Rijeka area, Rijeka (<5), and in Jelenje in Rijeka area (<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.