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Around the globe, Gillis (Gillis , غليس , גיליס ) is quite a rare principally boy's, but very infrequently girly first name. The first name Gillis is habitual in Sweden, where it is quite a rare boy's name, Belgium, where it is quite a rare principally masculine, but very infrequently feminine name, and the Democratic Republic of the Congo, where it is a rare boy's name. Measured by absolute frequency, this name is the most popular in the Democratic Republic of the Congo, the United States, and Sweden. More frequently, Gillis is the last name as well as the forename.
Gillis is also a name for the fictitious and mythical characters: .