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Cognomen Κλεάνθης (Kleanthis , Kleant , Kleanto ) , around the globe, is quite a rare family name. The last name Κλεάνθης is habitual in Greece, where it is quite a common surname, Canada, where it is an extremely rare surname, and the United States. More frequently, Κλεάνθης is the forename as well as the last name.