Namesakes
Muirchertach mac Muiredaig
(a.k.a. Muircheartach) (m) ?-c. 534 
Irish Kings 507-534
Muirchertach Mór ua Briain
(a.k.a. Muircheartach) (m) c. 1050-1119
Irish Kings 1101-1119
Muirchertach mac Lochlainn
(a.k.a. Muircheartach) (m) ?-1166
Irish Kings 1156-1166