Is there a built in way to rename an entire scaffold?

I don't think there's anything rails provides to rename the name of models/controllers/views/tests etc. once they are created - whether as a part of a scaffold, or not.

You will have to change it manually.

If it is a brand new app that you have just started on, it might be easier to just delete the whole directory/drop the database, and start over again.

If not, you will have to go through the files created/modified by the scaffold generation, and modify them manually.

Make sure you either drop_and_recreate the relevant table, or add a migration to rename the table. See How do you write a migration to rename an ActiveRecord model and its table in Rails? for some relevant advice.