McDonnell ~ Mac Domhnaill

The Story of the McDonnell Name

McDonnell is an anglicized form of the Irish Mac Domhnaill, meaning “son of Domhnall.” The personal name Domhnall is an ancient Gaelic name traditionally associated with the ideas of world, might, and rule. The same Gaelic name lies behind the Scottish surname MacDonald, reflecting the close connections between Gaelic Ireland and Scotland.

The McDonnell name has more than one important Irish history. One of the best-known families became associated with County Antrim, where the MacDonnells of the Glens rose to great prominence. Originally connected with the Scottish Hebrides, they came to Ireland as gallowglass warriors and eventually established themselves as one of the most powerful Gaelic families of Ulster.

The MacDonnells became Lords of the Glens of Antrim, and their story is closely connected with Dunluce Castle, one of the great medieval strongholds of the northern coast. The family eventually became Earls of Antrim, bridging the worlds of Gaelic Scotland and Gaelic Ireland.

There were also distinct Mac Domhnaill families in County Clare and Connacht, including native Irish septs who were not descended from the Scottish MacDonalds. This is an important reminder that the same Irish surname can represent several different family histories.

Behind the familiar name McDonnell lies a story of Gaelic kinship, warriors, Scotland, and Ireland. From the ancient name Domhnall to the MacDonnells who established themselves along the rugged coast of Antrim, Mac Domhnaill preserves the memory of a family shaped by the centuries-old connections between the Gaelic worlds on both sides of the Irish Sea.