Like the 1971-74 AMX which was badged "Javelin", the 1977 was badged "Hornet". 1968-70 and 1978-80 were a stand alone model (although the later cars were obviously Concord then Spirit based).
I wanted to add to this, the '75 and '76 VAM Rambler AMX sold in Mexico was based on the Matador Aero Coupe, but was also called simply AMX. The base car platform was still called the Rambler Classic, though, not the AMC Matador. Seems curious, that the Matador name wasn't taken advantage of in Mexico...