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Family name Renn (レン , Renn , 雷恩 ) , in the entire world, is a common last name. The surname Renn is habitual in Japan, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and Germany. Not in comparison with a country's population, it most frequently occurs in Japan, the United States, and Germany. Much less frequently, Renn is the forename as well as the last name.