Kaštelančić families are Croats and they are mostly from Solin area. In the past century, relatively most of Croatian residents bearing this family name were born in Split and in Solin area. In Podstrana in Solin area every third inhabitant had the family name Kaštelančić.
Prevalence
About 60 people with faimily name Kaštelančić live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number increased by 30 percent. They are located in only five naselja i to in Podstrana in Solin area (50), Zagreb (<10), Split (<10), Ploce (<5), and in Vrbanj on the Island of Hvar (<5).
Outside Croatia
Family name Kaštelančić is present in this form only in Croatia.
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.