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Last name Sehn (Sehn , 塞恩 , سيهن) , in the entire world, is quite a rare cognomen. The surname Sehn is habitual in Paraguay, where it is quite a rare surname, Brazil, and Canada, where it is a rare surname. In absolute terms, the name is most common in Brazil, Germany, and Canada. Much less frequently, Sehn is the forename as well as the last name.