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Cognomen Crumble (Cruma , Crumble ) , throughout the world, is a rare last name. The surname Crumble is habitual in the United States, where it is a rare surname, Australia, where it is a very rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and France. Very seldom, Crumble is the forename as well as the last name.