Definitions from Wiktionary (Kay)

▸ noun:  The name of the Latin-script letter K/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.
▸ noun:  Dated form of cay. [A small, low island largely made of sand or coral.]
▸ noun:  Alternative letter-case form of kay [The name of the Latin-script letter K/k.]

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