Etymology

Glennon

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

Irish Mac Leannáin
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The story

  1. Irish · derived fromMac Leannáin“son of Leannán”
  2. English todayGlennon

Reduced Anglicized form of Irish Mac Leannáin (“son of Leannán”), a personal name from leann (“cloak”) + -án (“diminutive suffix”).

Etymology from Wiktionary, CC BY-SA 4.0.