By default, cPanel created database names and database usernames are prefixed with the username of the cPanel account they are associated with. This behavior can be disabled in WHM.
- Log into WHM as the root user.
- Navigate to Server Configuration >> Tweak Settings.
- Click on the SQL tab.
- Change the option for 'Require a username prefix on names of new databases and database users' to Off.
- Click the Save button.
Any new databases or database usernames will be created without the cPanel account username prefix. This change doesn't affect existing databases or database usernames.