Etymology

Treacy

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Today it means: A surname from Irish. Full definition →

Irish Ó Treasaigh
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The story

  1. Irish · derived fromÓ Treasaigh“descendant of Treasach”
  2. English todayTreacy

Reduced Anglicized form of Irish Ó Treasaigh (“descendant of Treasach”), a personal name ultimately derived from treise (“strength, power”).

Etymology from Wiktionary, CC BY-SA 4.0.