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Last name Nenn (Nenn , เนเน่) , in all the world, is a rare surname. The last name Nenn is habitual in Malaysia, where it is a rare surname, Germany, where it is a very rare surname, and Canada. Measured by absolute frequency, the name is most common in Germany, the United States, and Malaysia. Much less frequently, Nenn is the forename as well as the last name.