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Surname Chiam (Chiam , เจียม , เชียม ) , across the world, is quite a common last name. The surname Chiam is habitual in South-eastern Asia, particularly Singapore, where it is quite a common surname, Malaysia, and Brunei. Not in comparison with a country's population, the name is most common in Malaysia, Singapore, and Australia. Also, Chiam is the forename as well as the last name.