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Last name Grail (Grail , Grael , Crater ) , across the world, is quite a rare family name. The surname Grail is habitual in France, where it is quite a rare surname, Panama, and the United States, where it is a rare surname. In absolute terms, it is the most numerous in the United States, France, and Brazil. Very seldom, Grail is the forename as well as the last name.