You can change the name of a database at any time.
To change a database's name:
Note: The prefix of the database cannot be changed.
Important: Database names should not exceed the maximum limit of 64 characters, inclusive of the prefix. For example, if your database prefix is 30 characters long, you must restrict the name of your database to a maximum of 30 characters, to conform to the limit (64). Four characters are reserved for internal use.
On successful renaming, an appropriate message appears in the Status panel.