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Last name Ейде (Eide , Ейде , Smith-Simonsen ) , across the world, is a common surname. The cognomen Ейде is characteristic of Northern Europe, particularly Norway, where it is a common surname, Denmark, where it is quite a rare surname, and Sweden. In absolute terms, the name is most common in Norway, the United States, and Egypt. Very seldom, Ейде is the forename as well as the last name.