Hi there. If your name was Guardian'd, then Bungie reviewed your name and determined that it either violated the Code of Conduct or changed it because it's a real person's name. If you have not used your 1 name change yet, you can change it to something else from your profile Settings page. Players get only 1 name change. Your name will not be reverted and there are no additional name changes at this time. Bungie has yet to announce if or how they will allow more later.