Thread:Wagwan piffting23/@comment-30706862-20190925133602/@comment-31129923-20190926221721

I'll admit that my paraphrasing of the conversaton regarding his name was loose, if not, even inaccurate. But the point actually stands that he, while not legally, changed his name to Bill. The conversation in no way insinuated he was still accepting to being refered to as "Marion". Besides in-game newspapers even refering to him by this name rather than his original, added with the aforementioned fact that people have changed their names in the past without legal means, supports this.

Also, the wikipedia article refers to Butch Cassidy as both names interchangeably, (hell, with Cassidy being used solely after the early life section) not his birth name almost solely, as you suggested. "Butch Cassidy" is even the page name, so that doesn't poke holes in that argument.