Where does “sir” come from?

sir (Chinese) comes from English Sir, from English sire, from Middle English sire, from Old French sire, from Vulgar Latin seior, from Latin senior, from Latin senex, from Proto-Indo-European sénos — old.

sir (Chinese): an honorific to a man senior than oneself, especially a teacher, a police officer or an engineer

Definitions

  1. an honorific to a man senior than oneself, especially a teacher, a police officer or an engineer

Ancestry of “sir”, step by step

StepLanguageWordMeaning
1EnglishSirAlternative letter-case form of sir; The titular...
2EnglishsireA lord, master, or other person in authority,...
3Middle EnglishsireUsed preceding the name or title of a knight,...
4Old Frenchsirenominative singular of sieur; master, sir, lord;...
5Vulgar Latinseior
6Latinseniorolder, elder; rather old; a lord, sir; an abbot
7Latinsenexold, aged, elderly; old person, old man, old...
8Proto-Indo-Europeansénosold
Every word from Proto-Indo-European sénos