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Surname Diehl (Diehl , ديل , Дил ) , in the entire world, is a common cognomen. The surname Diehl is characteristic of Germany, where it is quite a common surname, the United States, where it is quite a rare surname, and Namibia. Measured by absolute frequency, the name is most common in the United States, Germany, and Brazil. Much less frequently, Diehl is the forename as well as the last name.