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Cognomen Grum (Grum , Groom ) , across the world, is a common family name. The family name Grum is habitual in Slovenia, where it is quite a common surname, Monaco, and the United Kingdom, where it is quite a rare surname. In absolute terms, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, Grum is the forename as well as the last name.