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Family name Caster (Caster , كاستر , ล้อ) , in the world, is quite a common cognomen. The cognomen Caster is characteristic of Aruba, where it is quite a common surname, Belgium, where it is a rare surname, and the United States. In absolute terms, it is the most numerous in the United States, Indonesia, and France. Much less frequently, Caster is the forename as well as the last name.