In the United States, the word "esquire" after a person's name usually indicates that the person is a lawyer. However, there are no formal rules for the use of the title.
"Esquire" originally comes into English from the French word for "squire," a knight's apprentice. Over time, as England's elite became less militaristic, the term evolved to include a large number of professions, including sheriffs, lawyers, justices of the peace and other members of the educated class.
In the United States, the word was applied more exclusively to lawyers, but in other English-speaking countries, it still retains a fairly broad meaning. Bar associations across the United States have struggled to formalize the usage of the term "esquire" to avoid any misunderstandings that occur when a person not licensed to practice law applies the title "esquire" to his name.