Irish Kings: 3 kings
King Muirchertach mac Muiredaig (a.k.a. Muircheartach)   507-534  
King Muirchertach Mór ua Briain (a.k.a. Muircheartach)   1101-1119  
King Muirchertach mac Lochlainn (a.k.a. Muircheartach)   1156-1166