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Cognomen Kyros (کوروش , Kyros , Кир ) , worldwide, is a rare family name. The cognomen Kyros is habitual in Greece, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Kazakhstan. In absolute terms, it is the most numerous in Greece, Russia, and the United States. More frequently, Kyros is the forename as well as the last name.