esquire

n. 1 (usu. As abbr. Esq.) Title added to a man's surname when no other title is used, esp. As a form of address for letters. 2 archaic = *squire. [french from latin scutum shield]

n. Originally, a shield-bearer or armor-bearer, an attendant on a knight; in modern times, a title of dignity next in degree below knight and above gentleman; also, a title of office and courtesy; -- often shortened to squire.