EXEC sp_renamedb 'ExistingName', 'NewName'

The EXEC sp_renamedb expression is required.

The ExistingName factor is the name of the database that you want to rename.

The NewName factor is the name you want the database to have after renaming it.

Here is an example of renaming a database:

EXEC sp_renamedb 'RentalCars', 'BethesdaCarRental
GO