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Cognomen Willis (Willis , ויליס , 威利斯, among others...) , in the world, is a widespread last name. The last name Willis is habitual in Jersey, where it is quite a common surname, Jamaica, and Guam (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Willis is the forename as well as the last name.