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Cognomen Mathys (Mathys , คณิตศาสตร์ , Матис ) , in all the world, is quite a common last name. The cognomen Mathys is habitual in Switzerland, where it is quite a common surname, Belgium, where it is quite a rare surname, and Namibia. Measured by absolute frequency, it is the most numerous in Switzerland, Belgium, and South Africa. Likewise, Mathys is the forename as well as the last name.