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Throughout the world, วิลลิส (Willis , Wiliss , วิลลิส ) is a common male first name. The forename วิลลิส is characteristic of the United States, where it is quite a rare masculine name, Bahamas, and Hong Kong, where it is quite a rare predominantly boy's, but very infrequently feminine name. In absolute terms, it is the most numerous in the United States, Brazil, and Indonesia. More prevalently, วิลลิส is the last name as well as the forename.
วิลลิส is also a name for the fictitious and mythical characters: .