1) I had that well in mind, though I didn't put it in the book. My nominee for a proper name for Neptune is Rhea the Titaness, whose title is "Mother of the Gods" and whose name may mean something like "She who Flows."

2 etc.) That's a fascinating speculation. My guess is that as our species matures, some of the planets will be assigned different genders. I could see the Sun, Mars, Jupiter, and Prometheus/Uranus as the male planets, the Moon, Venus, Demeter/Saturn and Rhea/Neptune as the female planets, and Mercury as the ambivalent and ambisexual mediator among them: that would be a stable arrangement, energetically speaking.