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Surname Wilt (Wilt , Vilt , Welken ) , in all the world, is a common cognomen. The last name Wilt is habitual in Estonia, where it is quite a rare surname, Netherlands, and the United States. Not in comparison with a country's population, the name is most common in the United States, Netherlands, and France. Much less frequently, Wilt is the forename as well as the last name.