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In all the world, Κο. (Κο. ) is an extremely rare unknown gender first name. Much more frequently, Κο. is the last name as well as the forename.
Ko.
Άγγελος, Θοδωρα, Αλέκος, Χρύσα, 'Αννα, Χαρης, Γιώργος, Κριστιάν, and Κωστακης