Origin of the Name MacMillan
family history was found in the allfamilycrests.com archives. The Scottish Clan of McMillan held possessions on both sides of Loch Arkaig. A branch of the Clan settled in Knapdale, Argyllshire, in the sixteenth century. Their feudal grant of Knap from the Lord of the Isles was destined to MacMillan. By marriage one of their chieftains became allied to the Macneills, and owned Castle Sweyn. The chief of Knapdale branch was called MacMillan of Knap. These MacMillans built the Chapel of Kilmore. In their burial place there is a high stone cross with the legend in Latin: 'This is the cross of Alexander MacMillan'. The MacMillans of Glen Shera, Glen Shira, and others, are descended from a clansman, Gille Maol, who settled at Badokenan on Loch Fyne. The Knapdale succession became extinct, and MacMillan of Dunmore was made chief. His line also became extinct, and both the Campbells got possession.
In Ireland this name and its variants were introduced into Ulster Province by settlers who arrived from England and Scotland , especially during the seventeenth century. It was the 'Plantations of Ireland ' in the sixteenth and seventeenth centuries that marked the end of Gaelic supremacy in Ireland . While the influx of settlers in the wake of the earlier Anglo-Norman invasion of the twelfth century resulted in a full integration into Irish society of the new arrivals, the same never occurred with the Ulster Planters who maintained their own distinct identity.
It is sometimes used as a variant of the Gaelic name McMullan.
The MacMillan coat of arms came into existence centuries ago. The process of creating coats of arms (also often called family crests) began in the eleventh century although a form of Proto-Heraldry may have existed in some countries prior to this. The new art of Heraldry made it possible for families and even individual family members to have their very own coat of arms, including all MacMillan descendants.