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Cognomen Fassler (Fassler ) , across the world, is quite a common surname. The cognomen Fassler is habitual in Switzerland, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Taiwan, where it is a rare surname. In absolute terms, it is the most numerous in Switzerland, the United States, and France. Very seldom, Fassler is the forename as well as the last name.