In the past century, relatively most of Croatian residents bearing this family name were born in Dubrovnik.
Prevalence
Only a few people with faimily name Sedonja live in Croatia today, in households. They are located in only one small Croatian place, in Ljuta in Dubrovnik area (<5).
Outside Croatia
Family name Sedonja is present in five countries on three continents. "Sedonia " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.