Is there a way to find out your username?

[Ananka]

Can you remember a fourth email that would be linked to an account? If so go to technical forum under the sticky post Password Recoveries and click the first blue link. If you forget which email goes with each account you can try logging in to the forums and clicking User CP at the top. If you have an email or a forum login and password or a linked phone number you should be able to find out.