Sorry, I'm not sure what you mean. Do you mean the email address for you that the other person sees is incorrect?
Please can you give an example using a fictitious emaila ddress
Not a very clear question... but if I've got it correct...
Click the cog in the far top right corner of googlemail, select "mail settings" then click on the "accounts and imports" tab and on the far left of the "Send mail as:" section there is a link to edit the name your mails are sent as.
If I was to send an email to "[email protected]" would you receive it?
If you do then you've set the account up incorrectly and all you can do is start another account without the typo.
If you receive mails sent to "[email protected]" and it's just the name that is displayed when other receive mails from you that is incorrect then you can change it using my instructions above.