>>2641164Words and short phrases are non-copyrightable. So you are mistaken. Also, copyrights are not perpetual, they expire after a set period of time (unless Disney lobbies for another extension, that is).
You may, however, establish trademark rights in a name. That you can protect in perpetuity. None in the domain of IP rights is conditioned on the enforceability of another type, i.e., a protectable naming right does not terminate upon expiry of a related patent right.
t. 25+ years writing IP guides my peers rely upon, no joke; blatant appeal to authority