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Family name Willett (Willett ) , throughout the world, is a common surname. The last name Willett is habitual in Saint Kitts and Nevis, where it is quite a common surname, Antigua and Barbuda, and Australia, where it is quite a rare surname. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Australia. Much less frequently, Willett is the forename as well as the last name.