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Around the world, Castile (Castilla , Castella , Castiella ) is a rare largely female, but seldom male forename. The first name Castile is characteristic of the Democratic Republic of the Congo, where it is a rare feminine name, Colombia, where it is a very rare gender-neutral name, and Italy, where it is a very rare female name. Not in comparison with a country's population, it is commonest in the Democratic Republic of the Congo, the United States, and Philippines. More frequently, Castile is the last name as well as the forename.
Castile is also a name for the fictitious and mythical characters: .