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Around the world, كلايس (Claes , Claës , كلايس) is quite a common male first name. The first name كلايس is characteristic of Sweden, where it is quite a common boy's name, Denmark, where it is quite a rare male name, and Belgium, where it is quite a rare unisex name. Likewise, كلايس is the last name as well as the forename.
كلايس is also a name for the fictitious and mythical characters: Claes Waltin and Claes , the fictional character in Gunslinger Girl.