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Cognomen Kefalas (Kefalas , Κεφάλας, Кефалас) , across the world, is quite a common family name. The cognomen Kefalas is habitual in Greece, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Bulgaria, where it is a rare surname. In absolute terms, this name is the most popular in Greece, the United States, and Germany.