Etymology

Bresnahan

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

Irish Ó Brosnacháin
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The story

  1. Irish · derived fromÓ Brosnacháin“descendant of Brosnachán”
  2. English todayBresnahan

Reduced Anglicized form of Irish Ó Brosnacháin (“descendant of Brosnachán”), a personal name derived from Brosna, the name of a town and a river in County Kerry.

Etymology from Wiktionary, CC BY-SA 4.0.