Has No official USGS name. According to one of the local Whitney Area guru's who has been in the area for over 60 plus years, at one time a proposed name of Arctic Lakes Pass
was in the mix. But it never was followed through on back in the late 70's by the initiator, old Alan Bartlett. The same Alan Bartlett that authored most of the routes you mentioned accessing. Seems Galen had a part in the proposal as well.
BTW, that "pass" is pretty much inaccessible in the winter due to some very extreme avy conditions.A large windblown cornice has been known to build up right smack dab on/in that pass.
It can be seen very clearly in the lower L/H center below: