When a Rottweiler is crossbred with a German shepherd what hybrid does it produce?

I'm afraid it is just a Rottweiler, Shepherd mix. You could give it a fancy name if you like. For example if someone crosses an Akita with a Rottweiler, they call it a Rokita, but it will always be a mix what ever you call it. Be sure you don't pay over the odds for a designer dog, they are just mixed breeds with a fancy price tag.