The McFadyens are a very old tribe. They were the first Sept to join the Maclaines, although under dubious circumstances. When Hector Maclaine went to claim the lands given to him by the MacDonalds, he found the lands already under the possession of the McFadyens. For mutual protection (from various raiders and neighbouring tribes), the McFadyen Chief granted him permission to build a fortalice at the head of Lochbuie. After the castle was completed, Hector climbed to the top and shot an arrow through a bone that the McFadyen Chief was eating on the ground below. Not being foolish, the McFadyen Chief removed himself from the scene. Whether Maclaine was aiming for the bone, and hit, or at McFadyen, and missed, is a matter of speculation (and perspective).
Many McFadyens moved to the Colonies, settling in such places as Victoria County, in Canada, or to the United States, New Zealand, and Australlia. Some became farmers -- one of the largest seed companies in Canada is named after them -- and others were blacksmiths, merchants, teachers, etc,... The name McFadyen is still common on Mull, Islay, and Tiree.
James MacCormick of Londonderry was a signer of the "Gentlmen's Appeal to William and Mary" on the seige of that city. Another famous MacCormick was Cyrus Hall McCormick, the inventor of the first practical reaper, whose descendants founded the International Harvester Company. Queen Victoria had as her piper Calum Beag MacCormick.
There is a Chapel MacCormaig (Church of St. Charmaig) on the Isle of Eilean, at the mouth of Loch Sween. Mor MacCormick (Eilean Mor ui Charmaig in Gaelic), is owned by the Scottish National Party. The early and medieval Christian monuments and site on the island are under the guardianship of the Ancient Monuments Branch of the Scottish Development Department