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Globally, Mariss (Марис , Mariss , マリス ) is quite a rare epicene forename. The first name Mariss is characteristic of Latvia, where it is quite a rare boy's name, Kyrgyzstan, and Kazakhstan, where it is a rare male name. Measured by absolute frequency, it is commonest in Russia, Philippines, and the Democratic Republic of the Congo. Very seldom, Mariss is the last name as well as the forename.
Mariss is also a name for the fictitious and mythical characters: Maris Crane , character in Frasier.