If your name changes, notify the appropriate office below.
Notify the Registrar's office.
Notify the Alumni Relations office.
After it's changed...
When the above offices change your name in our administrative system, that change will be reflected everywhere your name is used. Gmail will also generate a new email address for you using your new name. While we can't tell you exactly when this change will happen on your Google account, it usually happens within a few hours (certainly by the next day). When you can no longer login using your old email address, just start by using your new first name and last name combination.
To verify what your current email address is, see this article:
After Gmail changes your address, your old email address will become an alias to your new one. This means that you will continue to receive email sent to your old address.