Did you know the Doom guy's real name is Shawn.
There is an unused Soundtrack called Shawn's shotgun or Shawn's got the shotgun. It's also the name of the main character in Doom the movie 2005.
No, his name is never said to be anything by ID software, and the final authority is ID, anything from any other source is just fanfiction. All official narratives from ID of the doom guy are written in the second person. They're about YOU.
On the other hand, the wolfenstein guy has the dubious name of BJ. BJ Blazkowicz. I guess just to give him a Jewish sounding name since he's fighting Nazis. And he's Commander Keen's grandpa. How's that for a kick in the teeth?