Modern MacKinlay Heavy Weight Tartan. Lennox was the home of this family who claim descent from Finlay, son of Buchanan of Drumkill. In Gaelic the name is MacFhionnlaigh, meaning "son of Finlay", or Finlayson. Little is known regarding them, but during the Irish "plantation" of the 17th century, some MacKinlays are said to have settled in Ulster where the name appears as Macginlay. People of the name were fairly numerous in the Glasgow area and near Loch Lomond, and some are found further north. William MacKinlay, President of the United States of America, was descended from David MacKinlay, an Ulster Scot.