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All around the world, カストロ (Castro , Kastro , カストロ ) is a common primarily masculine, but scarcely girly first name. The given name カストロ is characteristic of Guadeloupe, where it is quite a common masculine name, Luxembourg, where it is quite a rare epicene name, and Guatemala. In absolute terms, it most frequently occurs in Philippines, Tanzania, and Angola. Much more frequently, カストロ is the last name as well as the forename.
カストロ is also a name for the fictitious and mythical characters: Castro , the operatic character in the opera Al gran sole carico d’amore, Al gran sole carico d'amore and Castro Gomes , character in Os Maias.