Sending, receiving, and organizing email in Outlook.com
Hi KR,
Good day. Sorry to hear your problem. Unfortunately, you cannot rename, or correct an email name once it's been created. All you can do is create a new Outlook email address with the correct name/spelling, and add it as an alias to your Microsoft account. Then make the new alias as your primary sign-in address. Remove the old alias later if you no longer need it, unless it is the original Outlook alias, which may have restrictions.
I hope this helps.
Regards,
Jhun