esquire

From Middle English esquier, from Old French escuyer, escuier, properly, a shield-bearer (compare modern French écuyer (“shield-bearer, armor-bearer, squire of a knight, esquire, equerry, rider, horseman”)), from Late Latin scūtārius (“shieldmaker, shield-bearer”), from Latin scūtum (“shield”); probably akin to English hide (“to cover”). The term squire is the result of apheresis. Compare equerry, escutcheon.

Old French esquiere, esquierre, esquarre (“a square”) (whence modern French équerre), perhaps via a form like based esquire from bas d'esquire ("bottom of a square"), whence attested forms base (e)squire, e(s)quire bast.