Just to clarify the Grandfather/Fishtails thing:
The very first time they appeared was on Wikipedia (you can check the edit logs) and then someone (or the same person) copied that to the other registration website (musicbrainz whatever)
Since the GPS title is 99% confirmed, unless they are trolling, Fishtails must be real too cause it came from the same person that had the real acronym title before anyone.
Pepper(s) came from a scrobble so it doesn't seem that legit since there was another wrong GPS acronym scrobbled there.