Of the Name

MacNab is an occupational surname, one of the oldest and most direct in Scotland. Where most occupational surnames describe a trade (Smith, Fletcher, Mason), MacNab describes a sacred office: the hereditary abbacy of Glendochart. It is one of the very few Scottish surnames that records a specific religious and civic role rather than a craft or a physical characteristic.

The process by which it became a hereditary surname rather than a description was embedded in the nature of the Celtic Christian abbacy itself. In the Celtic church, unlike Rome, abbots were not bound by celibacy. They married and had children. Their sons often inherited the abbacy. Over generations, the role became dynastically hereditary: the same family providing the Abbot of Glendochart across multiple generations, each one known as Mac an Aba.

By the time of the first documentary record in 1124 AD, the name had already passed through enough generations to be fixed. The man recorded in that year did not choose his name as a description of his current role. He carried it as the inherited identity of his family line. The abbacy had become a surname. The surname had become a clan.

When Rome eventually brought Highland Scotland into conformity with canonical rules in the 12th and 13th centuries, the hereditary abbacy formally ceased. But the name did not. The clan continued to use Mac an Aba as their hereditary identity, now as clan chiefs rather than abbots, carrying the abbatial identity forward into a world that no longer had hereditary abbots. The name outlasted the office that created it by nine hundred years. It is still being given to children today.

The divergence of the MacNab spelling variants is not random. It follows a clear pattern driven by three historical forces: the replacement of Gaelic by English as the language of record in Scotland, the movement of Gaelic-speaking Scots through different emigration routes, and the practices of the English-speaking officials who wrote down the names at each point of contact.

The Mac to Mc contraction was almost universal in the Lowland Scottish and Ulster-Scots tradition from the 17th century onward. When the Plantation of Ulster brought Scottish settlers to northeastern Ireland from 1610, they carried their names with them, and the Mc spelling became dominant in Ulster Presbyterian records. When those Ulster-Scots families subsequently emigrated to America in the 18th century, particularly through Philadelphia and into the Appalachian backcountry, the Mc spelling came with them. McNab in America almost always traces either to this Ulster-Scots route or to direct Scottish emigration of the 19th century.

The double-B in McNabb is specifically Canadian and American. In spoken Gaelic, the final consonant of Aba is not merely a short B but a consonant with some weight behind it, particularly in rapid speech where the three words merge. English-speaking immigration officials in 19th century Ontario were not familiar with Scottish Gaelic. When they heard the name spoken, they wrote what they heard. What they heard was a final B that seemed to call for emphasis, and in English orthographic convention, emphasis on a final consonant meant doubling it. The 1825 MacNab Township settlers were recorded in a range of spellings across different officials’ registers, and McNabb became established as the dominant form in that specific community.

The lowercase Macnab reflects a different anglicization convention: treating the whole name as a single word without internal capitalization. This was common in Scottish legal and ecclesiastical records, where names were often written continuously without the prefix separated. It persisted in formal clan documentation and remains fully correct today.

The result is that five people named MacNab, Macnab, McNab, McNabb, and MacNabb could all be descended from the same family, could all trace their name to the same hereditary abbots of Glendochart, and could be entirely unaware that their name is the same name written five different ways by five different officials at five different points in a diaspora story spanning four centuries.