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Last name Thwin (Thwin ) , worldwide, is a common family name. The cognomen Thwin is characteristic of South-eastern Asia, particularly Myanmar, where it is quite a common surname, Singapore, where it is quite a rare surname, and Malaysia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in South-eastern Asia, particularly Myanmar, Indonesia, and Malaysia. Much less frequently, Thwin is the forename as well as the last name.