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Around the world, Kleiner (Kleiner
, קליינר
, Клейнер
) is a rare epicene forename. The given name Kleiner is characteristic of Colombia, where it is a rare masculine name, Ecuador, where it is a very rare male name, and Germany, where it is a very rare epicene name. In absolute terms, it is the most numerous in Colombia, Germany, and Brazil. Predominantly, Kleiner is the last name as well as the forename.
Kleiner is also a name for the fictitious and mythical characters: Kleiner Araber , the operatic character in the opera Julietta (Martinů) and Kleiner Sohn Zelmiras und Ilos , the operatic character in the opera Zelmira.