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Around the globe, קליין (Klein , Cline , Kline ) is quite a common gender-neutral forename. The first name קליין is habitual in Luxembourg, where it is quite a rare unisex name, Gabon, where it is quite a rare boy's name, and the Democratic Republic of the Congo, where it is quite a rare gender-neutral name. Measured by absolute frequency, it is the most numerous in the Democratic Republic of the Congo, the United States, and France. Predominantly, קליין is the last name as well as the forename.
קליין is also a name for the fictitious and mythical characters: Klein , the fictional character from Sword Art Online and Klein Lieschen , the operatic character in the opera Das Dorf ohne Glocke.