Where has my character name gone?
Character names are automatically removed if an account is inactive for a long period of time, which also removes your name from HiScores.
Once you are logged into game you will be asked to choose a new name, so get creative and think of something cool.
Account login names never change.
If you have received an email from Jagex addressed to 'Name unavailable' it means that your account does not currently have a Character name set. Don't panic, you can set one next time you log in.