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Cognomen Kustas (Kustas ) , around the globe, is a very rare last name. The cognomen Kustas is characteristic of Greece, where it is a very rare surname, the United States, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Greece, and the United Kingdom. Also, Kustas is the forename as well as the last name.