Sir - Wikipedia
https://en.wikipedia.org/wiki/Sir
OverviewEtymologyEntitlement to formal honorific address by regionEducational, military and other usageSee alsoExternal links Sir is a formal honorific address in English for men, derived from Sire in the High Middle Ages. Both are derived from the old French "Sieur" (Lord), brought to England by the French-speaking Normans, and which now exist in French only as part of "Monsieur", with the equivalent "My Lord" in English. Traditionally, as governed by law and custom, Sir is used for men who are knights and belong to certain orders of chivalry, as well as later applied to baronets and other offices. As the f…
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