In Croatia, Sejdin families are predominantly Bosniaks (from Hrvatska Kostajnica ), rarely Croats (from Podrinje (Bosnia) ). In the past century, relatively most of Croatian residents bearing this family name were born in Podrinje, Bosnia (Foca area) and in Bosanian Posavina (Bosanska Gradiska area). In Vojnovići in Podrinje (Bosnia) every fourth inhabitant had the family name Sejdin.
Prevalence
Only a few people with faimily name Sejdin live in Croatia today, in three households only. They are located in only threee naselja i to in Petraca in Dubrovnik area (<5), Novigrad (<5), and in Hrvatska Kostajnica (<5).
Outside Croatia
Family name Sejdin (including: Seedin , Sheydin , Seidin and Seydin ) is present in 18 countries worldwide.