Etymology

Guilfoyle

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

Irish Mac Giolla Phóil
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The story

  1. Irish · derived fromMac Giolla Phóil“son of St. Paul's follower”
  2. English todayGuilfoyle

Anglicized form of Irish Mac Giolla Phóil (“son of St. Paul's follower”), from mac + giolla + Pól.

Etymology from Wiktionary, CC BY-SA 4.0.