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Last name Guu (古 , Guu ) , in the entire world, is a widespread cognomen. The last name Guu is habitual in China, where it is quite a common surname, Myanmar, where it is quite a rare surname, and Saudi Arabia, where it is a very rare surname. In absolute terms, this name is the most popular in China, Myanmar, and Indonesia. Very seldom, Guu is the forename as well as the last name.