Mark Hamill is perhaps the most famous example. He tried to change his name to Luke Skywalker but decided against it when he discovered that not only would he become the legal property of George Lucas but under US Copyright law Mr Lucas would also be entitled to 99% of his future earnings and his first born child. Johnny Weissmuller tried to change his name to Tarzan and made plans to live in the jungle with a monkey, though recently unearthed documents suggest that was not a mental health issue but an attempt to evade the IRS. Then we have the Bonds. At sometime or other every one of them applied to change their name by deed poll but producer Chubby Brocolli wouldn’t allow it. Though strangely due to what I assume is a typo error on his application, George Lazenbywrote that he would like to be know as James Boned and as far as I’m aware, legally speaking, that is now his real name.
I’ve heard Hugh is already in the process of changing his name on his previous films so for example every new print of Christopher Nolan’s The Prestige will say “starring Christian Bale and The Wolverine”. That shows that Jackman is intent on erasing his own past and creating a new one and that could have a permanent effect on his psyche. To be honest, I wouldn’t be surprised if tomorrow he put on a yellow spandex suit and fake claws and took to the streets to fight crime.