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Around the world, Casto (Casto , Casta , Kasta ) is a common epicene given name. The forename Casto is habitual in Equatorial Guinea, where it is quite a common masculine name, Nicaragua, where it is quite a common gender-neutral name, and Bolivia, where it is quite a rare unisex name. Not in comparison with a country's population, this name is the most popular in Tanzania, Mexico, and India. Also, Casto is the last name as well as the forename.