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Cognomen Xanthos (Xanthos , Ксанф ) , in the entire world, is quite a rare last name. The last name Xanthos is characteristic of Greece, where it is quite a rare surname, Switzerland, where it is a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in Greece, the United States, and Australia. Much less frequently, Xanthos is the forename as well as the last name.