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Worldwide, Castle (Castle , 卡索 , キャッスル) is a rare unisex given name. The first name Castle is habitual in Indonesia, where it is a rare epicene name, Saudi Arabia, where it is a rare boy's name, and Tanzania, where it is a very rare masculine name. Measured by absolute frequency, it most frequently occurs in Indonesia, the United States, and Egypt. Much more frequently, Castle is the last name as well as the forename.
Castle is also a name for the fictitious and mythical characters: .