Hi Durd,
Generally, you would not choose to copyright a stage name. Some sort of registered mark would be more appropriate. You can look up the stage name
here to see any rights to such name.
Also, here is an excerpt from the link above regarding copyrights:
A Copyright is a form of protection provided to the authors of “original works of authorship” including literary, dramatic, musical, artistic, and certain other intellectual works, both published and unpublished. The 1976 Copyright Act generally gives the owner of copyright the exclusive right to reproduce the copyrighted work, to prepare derivative works, to distribute copies or phonorecords of the copyrighted work, to perform the copyrighted work publicly, or to display the copyrighted work publicly.
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Regards,
Mike