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Surname Luethi (Lüthi , Luethi ) , in the entire world, is quite a rare cognomen. The family name Luethi is habitual in Liechtenstein, where it is quite a common surname, Switzerland, and Panama, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Switzerland, the United States, and Germany. Very seldom, Luethi is the forename as well as the last name.