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Last name Ruh (Ruh , ルー , 魯 ) , in the world, is quite a common surname. The cognomen Ruh is characteristic of Switzerland, where it is quite a rare surname, Germany, and Malaysia, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and China. Very seldom, Ruh is the forename as well as the last name.