Why is something genuine called “the Real McCoy?”
The “real” McCoy is most likely a person named Kid McCoy. Kid McCoy was the world welterweight boxing champion from 1890 to 1900. McCoy was such a popular fighter that other, lesser-known fighters traveling the small-town boxing circuit claimed to be Kid McCoy in order to draw crowds and increase the size of the gate revenue. The problem of imitators became so problematic that McCoy began calling
himself as Kid “The Real” McCoy.