In the entire world, Castillan (Castellano 
, Castillan 
, Castellanus ) is a rare gender-neutral first name. The first name Castillan is habitual in the Democratic Republic of the Congo, where it is a rare feminine name, Italy, where it is a rare dominantly male, but seldom girly name, and the United States, where it is an extremely rare dominantly male, but uncommonly female name. More prevalently, Castillan is the last name as well as the forename.