Kaštelan families are Croats and they are mostly from the Island of Rab. In the past century, relatively most of Croatian residents bearing this family name were born on the Island of Rab and in Rijeka.
Prevalence
About 460 people with faimily name Kaštelan live in Croatia today, in 220 households. There were 400 of them in the middle of the past century, and their number increased by 20 percent. They are located in the most of Croatian counties, in 24 cities and 28 other places, mostly in Barbat na Rabu on the Island of Rab (85), Zagreb (45), Omis (45), Rijeka (40), and in Split (35).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.