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Surname Weldon (Weldon , ולדון , ولدون) , around the world, is a common cognomen. The cognomen Weldon is habitual in Ireland, where it is quite a common surname, the United States, where it is quite a rare surname, and Kenya. Measured by absolute frequency, it most frequently occurs in the United States, Kenya, and the United Kingdom. Also, Weldon is the forename as well as the last name.