I dunno, Darth Vader is pretty evil-sounding. It makes more sense that Anakin changed his name at some point to something more sinister. The issue is that Darth became a title given to any goofball with a red lightsaber instead of a unique first name.
I always thought it would have made sense that Jedi adopt a new ‘Jedi Knight’ name after being knighted - kind of how Pope’s take a new name. That way “Ben” Kenobi would have been his rightful name, and “Obi-Wan” was his Jedi name.
Which would explain why Anakin Skywalker took “Darth Vader” as his name - once he was ‘no longer the learner’ - it was his new name to indicate he had completed his training.
I’ve always liked that idea in the context of prequel rewrites, but Vader gets more offended than would make sense if that were the case when he’s called Anakin in RotJ. I also thought it might be interesting if Anakin Skywalker was the Jedi name like suggested above, but then Luke calling himself Skywalker would be a little weird, unless it’s not.