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Cognomen Tiam (Tiam , เตียม , เตี้ย) , worldwide, is a common surname. The cognomen Tiam is characteristic of Malaysia, where it is quite a common surname, Cameroon, and Lesotho, where it is quite a rare surname. In absolute terms, the name is most common in Malaysia, Cameroon, and Philippines. Much less frequently, Tiam is the forename as well as the last name.