McCoy

noun
Mc·​Coy | \mə-ˈkȯi \

Definition of McCoy 

: something that is neither imitation nor substitute often used in the phrase the real McCoy

First Known Use of McCoy

1913, in the meaning defined above

History and Etymology for McCoy

alteration of Mackay (in the phrase the real Mackay), of unknown origin

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The first known use of McCoy was in 1913

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