 Why does the crew later refer to Ha-Adamah as Adam?
It was for this reason that Glaser used that model no more, but built others more amenable. And those two ... why, they could well be Earth-people. There was a man and a woman, and they were clothed either in very bright garments or in no garments at all, but only in a very bright light. "Ha-Adamah," said the man. The captain was a little puzzled by this, but he went on doggedly: "Ha-Adamah, what do you think that we are? "You are not anything till I name you. "Pick from the trees," said Ha-Adamah, "and then it may be that you will want to sleep on the grass.
 Ha-Adamah is Adam's Hebrew origination.
 He responds to Adam, and they decide it's his true name  Ha-Adamah is Adam's Hebrew origination.  The planet feels so much like the Garden of Eden, that they begin to believe he is Adam  They want to test Adam and see if he accepts it as his name.