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Last name Ow (Ow , โอว , Оу ) , in the world, is a common surname. The last name Ow is characteristic of Singapore, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Switzerland. Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Singapore, Myanmar, and Malaysia. Very seldom, Ow is the forename as well as the last name.