Family names or last names passed down through generations that tell you who your relatives are.
From sur- (over/above, from Old French sus) + name. Surnames emerged as populations grew and you needed to distinguish between multiple Johns or Marys.
Surnames are basically humanity's way of keeping family trees organized, and they often tell stories—many surnames come from jobs (Smith, Miller), places (York, Hill), or father's names (Johnson, O'Brien). Some cultures still don't use surnames or are only adopting them recently, which shows it's actually a pretty new human invention.
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