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Last name Theng (Theng , เทง , เท่ง) , globally, is a common family name. The family name Theng is characteristic of South-eastern Asia, particularly Malaysia, where it is quite a common surname, Singapore, where it is quite a rare surname, and Laos. Not in comparison with a country's population, it is commonest in Malaysia, India, and Indonesia. Much less frequently, Theng is the forename as well as the last name.