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Family name เพ็ญแสง (เพ็ญแสง , Pensang , Pensaeng ) , globally, is a rare last name. The last name เพ็ญแสง is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Likewise, เพ็ญแสง is the forename as well as the last name.