Mackinnon comes from a Scottish surname meaning "son of the fair-born one" or "son of Fingon."
MacKinnon is a Scottish Gaelic surname of considerable antiquity, derived from "Mac Fhionghuin" — meaning "son of Fionnghuin," where Fionnghuin breaks into "fionn" (fair, white) and "ghuin" (born), yielding the approximate sense of "fair-born" or "born of brightness." The MacKinnon clan has ancient roots on the Isle of Mull and the Isle of Skye in the Scottish Hebrides, where they served for centuries as hereditary keepers of the Abbot's crozier at Iona — guardians, in other words, of one of the most sacred relics in early Scottish Christianity. The clan's motto, "Audentes Fortuna Juvat" (Fortune favors the bold), is borrowed from Virgil.
As a surname, MacKinnon has been carried by poets, politicians, and activists across the Scottish diaspora. Catherine MacKinnon, the American feminist legal scholar who developed the legal framework for sexual harassment law in the United States, gave the name a twentieth-century intellectual resonance that extended far beyond its Hebridean origins. In Canada, where Scottish immigration was particularly dense, MacKinnon appears frequently in the historical record of Nova Scotia and Prince Edward Island.
As a given name, MacKinnon follows the broader contemporary trend of Scottish clan surnames crossing over into first-name use — a pattern also seen with MacAllister, MacPherson, and McKinley. Parents drawn to MacKinnon typically value its specificity: it is unmistakably Scottish, carries centuries of clan history, and has a strong, three-syllable rhythm that works well for both boys and girls. It announces heritage with confidence.