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All around the world, Κωστοπούλου (Κωστοπούλου ) is an extremely rare unknown gender first name. Much more prevalently, Κωστοπούλου is the last name as well as the forename.
Kostopoulou, and Kostopoulu
Ειρήνη, Ιωάννα, Ελένη, Μαρία, Αναστασία, Αλεξάνδρα, and Παναγιώτα