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Cognomen แสงเพ็ญ (แสงเพ็ญ , Sangpen , Saengpen ) , in all the world, is a rare family name. The family name แสงเพ็ญ is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, แสงเพ็ญ is the forename as well as the last name.