I had a friend in High School that was convinced that Dafydd Ab Hugh was a pen name for Peter David as the humor and some of the style of writing was similar.
I hadnt heard or read that but then I hadnt heard or read anything discounting that either so I didnt disagree with him as he was the only other person in school reading the books with me lol.
I have met Peter David. I have met Dafydd ab Hugh.
Trust me, they're not the same person.