MLB.TV Help Center
How do I change the nickname associated with my MLB Account?
If you would like to change the nickname associated with your MLB Account, click on "Account Settings" after logging in through the "Log In" or "Account" button on the top right of most MLB.com pages. This will bring you to your MLB Account page.
In MLB Account Settings, click on the option where it says "Name". In the window that opens, enter the new full name and nickname you would like, and then click "Save."
