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Surname Duoai (Duoai ) , worldwide, is an extremely rare family name. Much more frequently, Duoai is the forename as well as the last name.
哚嗳, 喥嬡, 喥曖, 嚉爱, 多哎, 多爱, 多艾, 悳愛, 朵爱, and 铎癌
Liu, and Huang