Thanks for the link but if you check your own source youll find it says Only two islets break the long extent Eilean a Ghiubhais midway near the southern shore and another at the lower end with a ruined chapel and the buryingplace of the Camerons of Lochiel holders of the estate of Achnacarry If you then load the map  scroll right to the west end of the loch it gives the same name for the islet in quetion as the modern one Eilean Loch Airceig oldmapscouk is a pretty useful site though