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Definitions of Kay:
name: A female given name (common: 1 in 1408 females; popularity rank in the U.S.: #272)
name: A surname (common: 1 in 12500 families; popularity rank in the U.S.: #1508)
noun: The name of the Latin-script letter K.
noun: (colloquial) A kilometer.
noun: (colloquial) A thousand of some unit (from kilo-).
noun: A surname from Middle English derived from several Old and Middle English words; also adopted by immigrants whose surnames began with a K.
noun: A male given name from Welsh derived from the surnames, or from a rare medieval given name (as the Sir Kay of Arthurian legend), Welsh Cai, Latinized as Caius, related to the modern male name Kai.
noun: A short form of Katherine and other female names beginning with a "K"; popular as a middle name.