Someone else noticed that the names of the warlock’s pet suddenly switch whenever they are summoned anew? I was already disappointed that my wrathguard changed its name after visiting the barber shop (I used its name in a story and wanted to stick with it…) but now I discovered that I can’t even just settle with the new name… because every time I resummon the same pet, its name has changed again!!
New feature or a bug? I hope the latter… it would be weird if each warlock just suddenly knows an unlimited amount of demon names to summon them, as knowing a demon’s name is giving them the power to do so in the first place.
My Voidwalker names the same (even after visiting the barber) but my Imp’s name changed even before i went to the barber and it randomly changes when i summon it, though not every time.
My Imp has been called Aztip since vanilla so yeah i hope i can get that back too.
This is why I came here, too - just noticed it with my Incubus. Spent a few hundred gold rerolling his name… only for it to be made obsolete with the next summon.
… I hope I can get mine back 
… or at least keep one.