In Croatia, Kastropil families are Croats (from Split ). In the past century, relatively most of Croatian residents bearing this family name were born in Split.
Prevalence
Only a few people with faimily name Kastropil live in Croatia today, in one household only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in one Croatian city only, in Split (<5).
Outside Croatia
Family name Kastropil is present in 7 countries on four continents.
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.