Well, Martians come from Mars, and Jovians from Jupiter, but what about those pesky Venusians? Well, some say that the correct form for inhabitants of Venus is Venerean, with an adjectival form of venereal. Of course, venereal has picked up a whole 'nother meaning that has little to do with love and more to do with pathology. So, how about the other planets? Mercury, Hermetic or Mercurian, Mercurial? Earth, Earthling, Terran, Tellurian? Saturn, Saturnine or Chronan? Neptune, Neptunian or Poseidonian? Uranus, Urantian, Uranian, or Uranial? Pluto, Plutonian?

don't forget the Solarians. and maybe the Moonies?

Moonies? Or Loonies?

Lunatics, Selenians (isn't that what H G Wells called them?). Solarians, Helians, Sunny Folk.

Well, I like Terrans, and couldn't we just use figmentarians for the rest, at least for now?