I thought these Keppoch clan members were MacDonalds, but I can't remember where I heard that from. Perhaps the link to them as having been on one of the islands whose well dried up first. I've a feeling I meant the clan Kessanach now, too. Been a while since I've used that story or been on that tour route.
"Lochan nan Corp received its name from...a funeral party from Glenfinglas, passing over the mountain to the churchyard of St. Bride.... [They] passed over the loch imagining that the frozen surface was strong enough...the ice gave way and the whole company...perished in the loch." (W. Marshall, Historic Scenes in Perthshire, 1879, p. 394) The name of the family isn't recorded but is thought to be McKinley's from the fact of where they came from and were going to bury the body, and explains the MacGregors coming to occupy Glenfinglas at that time.
Locals know the story and say the coffin and all the people in the funeral procession had to be on foot by the custom of that day. The loch being shallow meant it was usually frozen solid and used as a regular route being the lowest pass from the church to the burial ground just on the other side of loch lubnaig. One deeper patch hadn't frozen in some tellings, in others a fierce storm was raging. That or some beastly and evil otherworld creature had come up and dragged them down, none can tell for none survived.
And if you walk out after dark in winter, keep off the centre of the roads, for if you see a ghostly funeral procession you will fall under the geis to follow in it's path, and the path of that one didn't end at a church you could then run away home from. (told me on a dark and creepy night) LOL