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Surname Portmann (Portmann ) , in the entire world, is quite a common last name. The cognomen Portmann is habitual in Switzerland, where it is quite a common surname, Paraguay, where it is quite a rare surname, and France. Not in comparison with a country's population, it is the most numerous in Western Europe, particularly Switzerland, France, and Germany. Much less frequently, Portmann is the forename as well as the last name.