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Family name Gillis (Gillis , غليس , גיליס ) , around the globe, is a common last name. The cognomen Gillis is habitual in British Virgin Islands, where it is quite a common surname, Belgium, and Canada (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, Canada, and Yemen. Very seldom, Gillis is the forename as well as the last name.