The name Aonach Mòr implies that the mountain is bigger than its close neighbour to the south, Aonach Beag (small ridge), to which it is linked by a high bealach.
Navnet Aonach Mòr betyder, at det er større end naboen tæt mod syd Aonach Beag (lille højderyg), der er forbundet med et højt bealach.