 It is believed that the mountain takes its name from the settlement of Achallader at the foot of the northern slopes and translates from the Gaelic as “Field of hard water” which referred to the area around Loch Tulla which often flooded and froze in the past.Achallader is a farm today but it was formally the site of Achallader Castle one of Campbell of Glenorchy’s seven strongholds, the remains of which can still be seen next to the farmhouse.However, Hamish Brown and others give the hill's translated name as “Hill of the Mower”.