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Last name Oon (Oon , وون , โออ่อน) , all around the world, is a common surname. The family name Oon is characteristic of Malaysia, where it is quite a common surname, Singapore, and Taiwan, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in South-eastern Asia, particularly Malaysia, Indonesia, and Singapore. Also, Oon is the forename as well as the last name.