Why are the Greys called Terrans since that would mean from Earth?? since the other name for Earth should be Terra as in Terra Firma ("solid earth" in Latin)
Try not to read too much into it. In this story, they are Terrans. People from Earth are Humans. As in people from Pantheria are Pantherians. And Echo (Ecko) is a Teldarian from Teldar. Acladeans from Acladia.
