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Family name Thian (Thian , เทียน , Тхан ) , around the globe, is quite a common cognomen. The last name Thian is characteristic of South-eastern Asia, particularly Malaysia, where it is quite a common surname, Brunei, and Singapore, where it is quite a rare surname. In absolute terms, it is commonest in South-eastern Asia, particularly Malaysia, Indonesia, and Myanmar. Likewise, Thian is the forename as well as the last name.