The Collaborative International Dictionary of English v.0.48:

Garcon \Gar`[,c]on"\, n. [F.]
   1. A boy; a young unmarried man.
      [Webster 1913 Suppl.]

   2. A serving boy or man; a waiter; -- used in direct address;
      as, garcon, please bring a glass of water -- in Eng.
      chiefly applied to French waiters.
      [Webster 1913 Suppl. +PJC]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "garcon":
   boy, bub, bubba, buck, bud, buddy, butler, chauffeur, coachman,
   colt, cub, driver, equerry, fellow, fledgling, gardener, gentleman,
   gillie, hobbledehoy, houseboy, houseman, lad, laddie,
   lord-in-waiting, man, manchild, manservant, master, muchacho, pup,
   puppy, schoolboy, sonny, sonny boy, valet, valet de chambre, whelp,
   young man, youth