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All around the world, Kū (Ku , Kuu , Kü ) is a widespread predominantly female, but scarcely masculine given name. The first name Kū is characteristic of India, where it is quite a common principally female, but very infrequently masculine name, Macao, where it is quite a common epicene name, and Hong Kong, where it is quite a rare epicene name. In absolute terms, it is commonest in India, Indonesia, and Vietnam. Much less frequently, Kū is the last name as well as the forename.
Kū is also a name for the fictitious and mythical characters: Kū Fei , the fictional character from Negima! Magister Negi Magi.