Check Out The Real Meaning Of "Sir"

 Here are some definitions that explain the meaning of these highly recognisable titles: Sir ,,,,

Sir' derives from the honorific title “sire” , used in Spanish, Italian, French, German, and Swedish. Sire developed alongside the word seigneur, also used to refer to a feudal lord. Both derived from the vulgar latin senior, sire comes from the nominative case declension senior and seigneur, the accusative case declension seniōrem.

The prefix is used with the holder's given name or full name, but never with the surname alone. For example, whilst Sir Alexander and Sir Alexander fleming would be correct, Sir Fleming would not.