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Cognomen Riff (Rifo , Riff , Riffe ) , globally, is quite a common last name. The family name Riff is characteristic of Chile, where it is quite a common surname, France, where it is quite a rare surname, and Morocco. In absolute terms, this name is the most popular in the United States, Chile, and France. Much less frequently, Riff is the forename as well as the last name.