This pass is an ancient trade route between the people on either side of Pir Panjal. The local name for this pass is a generic name of pass. There are many other passes in Lahaul and Spiti which have specific names (Kunzam La, Baralacha La, etc.). This is suggestive of the fact that this must have been the oldest and most frequented pass in the region, or the fact that it is the main pass leading from one cultural region to another, quite different one, to the north. The name Rohtang comes from Persian/ Farsi words Ruh+ Tang which means pile of dead bodies.