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Last name Then (Then , Тхен , แล้ว) , all around the world, is a common family name. The cognomen Then is habitual in the Dominican Republic, where it is quite a common surname, Malaysia, and Brunei, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Malaysia, and the Dominican Republic. Also, Then is the forename as well as the last name.