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Cognomen Ао (Ao , Ао , Aou ) , in the world, is a widespread family name. The family name Ао is habitual in Macao, where it is a widespread surname, Mozambique, where it is quite a common surname, and China, where it is quite a rare surname. In absolute terms, it most frequently occurs in China, India, and Macao. Much less frequently, Ао is the forename as well as the last name.