In Croatia, Kastrat families are mainly Croats (from Rijeka ), less frequently Bosniaks (from Plav, Montenegro ). In the past century, relatively most of Croatian residents bearing this family name were born in Split and in Plav, Montenegro.
Prevalence
About 10 people with faimily name Kastrat live in Croatia today, in two households only. They are located and another small Croatian place , mostly in Rijeka (<5), Lozica (<5), Zagreb (<5), Varazdin (<5), and in Kastel Luksic (<5).