Note: By default, the display name is the name of the user in the Admin Console.Your users can change their own display name in Gmail by following these steps:
- Log in to Gmail
- Click on the Settings icon at the top-right and select See all settings.
- Switch to the Accounts tab.
- Under Send mail as, click on Edit info on the email address that you want to edit.
- Type your preferred name in the text box, and click on the circle beside the text box to select it.
- Click Save changes.