His Jagex account name is Andrew. His private account is unknown, but all JaGex moderators have a private RuneScape account. Recently, it is thought that Greenjer is his private account, but there has been no exact confirmation. If anyone can talk to Greenjer in-game, they might be able to find out more information.
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There is no RuneScape 3 - the current version is RuneScape 2. There are, however, some scams that claim to be the next RuneScape version. Those are Web sites that want to steal your legitimate RuneScape account (when you "login" with your RuneScape username and password into the scam site).
I have a runescape i do not want the username is: Nelly 9999 and the password is: maxxy
That's the sweet part of runescape by adding that now it would be harder to hack your account. But otherwise you log in in as your original account to get on to runescape.
It means the same as "login" in other contexts: to identify yourself by a username and password.
I don't think you can, but maybe check the email from when your account was made..?