The name of E.T. is revealed in the unfinished sequel.
Not shortly after the original film's release, Steven Spielberg and writer Melissa Mathison collaborated on a nine-page proposal for E.T. 2: Nocturnal Fears. Elliott and his companions were captured by nasty aliens in the sequel, and E.T. returned to free them. The biggest surprise in the script? Zrek is the name of E.T.