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Family name Оу (Ou , Ow , Virak ) , all over the world, is a widespread surname. The family name Оу is habitual in Singapore, where it is quite a common surname, Macao, and Bermuda (explore the name in all countries). Measured by absolute frequency, it is commonest in China, Algeria, and Myanmar. Much less frequently, Оу is the forename as well as the last name.