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Muirchertach (modern spelling: Muircheartach, anglicised as Murtagh) is an Irish language male given name meaning "mariner". Muirchertach was borne by several figures from legend and history, including:

  • Muirchertach mac Ercae, great-grandson of Niall of the Nine Hostages and High King of Ireland
  • Muirchertach mac Néill, 10th-century king of Cenél nEógain
  • Muircheartach Ua Briain, 12th-century High King of Ireland
  • Muirchertach Mac Lochlainn, 12th-century king of Cenél nEógain
  • Muirchertach mac Maelruanaidh Mor, obscure king of Moylurg