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Cognomen Melby (Melby ) , throughout the world, is quite a rare family name. The surname Melby is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Sweden, where it is a rare surname. In absolute terms, the name is most common in the United States, Norway, and Mexico. Very seldom, Melby is the forename as well as the last name.