That or just signup another account with the correct spelling. I would imagine that is what Staff will tell you to do anyways. Since you don’t have a blog and the spelling of the name you are using now would be ‘uncommon’, I don’t see a problem with forgetting about that account and just creating a new one. Especially if you are getting a blog on the next turn. If you are not going to use a blog, does changing your name really matter much, especially if you are only using this account for Akismet purposes?
The reason i suggested contacting support was that to sign up for a new account, you have to use a different email address. I just thought that support may be able to completely delete the record, and the OP could use the same email address for his/her new account.