Muirchertach High King of Ireland Irish language Kjartan List of Irish-language given names Magh Luirg Muircheartach Ua Briain Muirchertach Mac Lochlainn Muirchertach mac Maelruanaidh Mor Muirchertach mac Muiredaig (Mac Ercae) Muirchertach mac Néill Murtagh (name) Niall of the Nine Hostages