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Family name Graul (Graul , Грауль ) , globally, is quite a rare cognomen. The surname Graul is characteristic of Western Europe, particularly Luxembourg, where it is quite a rare surname, Germany, and Austria, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Germany, the United States, and France. Much less frequently, Graul is the forename as well as the last name.