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All over the world, Twain (Twain , 吐温 , Твен ) is a rare principally male, but very infrequently girly forename. The forename Twain is habitual in Jamaica, where it is quite a rare male name, Trinidad and Tobago, and Australia, where it is a very rare male name. Measured by absolute frequency, this name is the most popular in the United States, Jamaica, and Trinidad and Tobago. Likewise, Twain is the last name as well as the forename.