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Surname Thway (Thway ) , throughout the world, is a common cognomen. The cognomen Thway is characteristic of Myanmar, where it is quite a common surname, Mongolia, where it is quite a rare surname, and Singapore, where it is a rare surname. Not in comparison with a country's population, the name is most common in Myanmar, Mongolia, and Malaysia. Much less frequently, Thway is the forename as well as the last name.