I believe the name is copyrighted to Marvel, and you could potentially be sued if they find out. Buuuut if you want to risk it, Wikipedia adds this:
"The applicant may be required to give a reasonable explanation for wanting to change their name. A fee is generally payable, and the applicant maybe required to post legal notices in newspapers to announce the name change. Generally the judge has limited judicial discretion to grant or deny a change of name, usually only if the name change is for frivolous or immoral purposes, such as changing the name to God, Superman, Copyright, Delicious, or Pussycat."