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Surname Rochat (روشا , Rochat , Роша ) , in the world, is quite a common cognomen. The last name Rochat is characteristic of Switzerland, where it is quite a common surname, Monaco, and Bahrain, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Switzerland, France, and the United States. Very seldom, Rochat is the forename as well as the last name.