What are the legalities of this? I'm not entirely sure a band name is beholden to any restriction, like joining SAG or something. I don't think any reasonable human would mistake the two entities. I am sure there are hundreds of other people named Owen Hart in this world, who would be similarly forced to change their names, lest something they do reflect poorly on a grown man who made a living pretending to hurt people while wearing spandex.
Similarly, you cannot copyright a title of a work.
Some suggestions: Pwned Hart; The Cease and Desist Order; Blue Blazer's Epitaph; The Lethal Head-Drops; Canadian Brainsplatter; The Stunt Failures
Similarly, you cannot copyright a title of a work.