JOCKEY, a professional rider of race-horses, now the current usage (see HORSE-RACING). The word is by origin a diminutive of " Jock," the Northern or Scots colloquial equivalent of the name " John " (cf. JACK). A familiar instance of the use of the word as a name is in " Jockey of Norfolk " in Shakespeare's Richard III. v. 3, 304. In the 16th and 17th centuries the word was applied to horse-dealers, postilions, itinerant minstrels and vagabonds, and thus frequently bore the meaning of a cunning trickster, a " sharp," whence " to jockey," to outwit, or " do " a person out of something. The current usage is found in John Evelyn's Diary, 1670, when it was clearly well known. George Sorrow's attempt to derive the word from the gipsy chukni, a leavy whip used by horse-dealing gipsies, has no foundation.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)