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Cognomen Luthi (Luthi , Lüthi , لوثي) , in all the world, is a common last name. The last name Luthi is characteristic of Switzerland, where it is a common surname, Eswatini, where it is quite a common surname, and South Africa, where it is a rare surname. Not in comparison with a country's population, the name is most common in Switzerland, the United States, and France. Much less frequently, Luthi is the forename as well as the last name.