Etymology

Mulcahy

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

Irish Ó Maolchathaigh
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The story

  1. Irish · derived fromÓ Maolchathaigh“descendant of the devotee of (Saint) Cathach”
  2. English todayMulcahy

Reduced Anglicized form of Irish Ó Maolchathaigh (“descendant of the devotee of (Saint) Cathach”), a byname from cathachyss (“warlike”).

Etymology from Wiktionary, CC BY-SA 4.0.