By creating a thread about deleting your account you have made it so that other people have mentioned your account at lease 5 or 6 times already.  Now you need to go back and convince all of these people to edit their posts that mention your account if you want it gone completely. Not sure how much of a "clean break" you wanted from this forum but you may be spreading the name rather than making it go away by bringing more attention to your account. So now, even if you change the name on the account someone could look at this post discussing the name change and see what name you used and what your new name is.