Origin of equerry
- French écurie stable from Old French escurie from escuier squire squire
From American Heritage Dictionary of the English Language, 5th Edition
- From an alteration of earlier esquiry (through the influence of the unrelated Latin equus), from Middle French escuirie, escuerie, derivative of escuyer (“squire”), or alternatively from Medieval Latin scuria (“stable”), from Old High German scura (“barn”). Compare esquire.