After the Megaservers activations DCUO team discovered an issue where DCUO players could choose a character name that was already taken. This issue makes the servers unstable and all duplicated characters were renamed. If you are one of the affected players Rename Token will be sent to you, but this is not the end of your troubles:
Unfortunately these players will have probably lost there friends lists, ignores, and mail. If you have lost an unclaimed item from your mail, please contact the Customer Support Group and they will gladly grant you replacements.