«Trade name» is the name that identifies a commercial establishment.
The right of a trade name is acquired if the use of the name is public, in good faith and continues over a period of more than 6 months. But the trade name may also be registered as a trademark. Some examples of trade name: Dormelles, KFC, El Español, Comandato, etc..
The business name registration is of considerable importance because exist a presumption of ownership in favor of the registrant.