If people from Vancouver are called Vancouverites, and people from Edmonton are called Edmontonians than people from these various planets/planetoids could be called:

Mercury - Mercurites
Venus- Women
Earth - Earthlings
Mars - Men
Saturn - Saturns
Jupiter - Jupiteronians
Uranus - Ur-anusaurs (like dinosaurs,... or "Is your bum sore??" whichever you fancy...come on, that is funny.)
Neptune - Neptuners
Pluto - Plutons (like Protons)
Quaoar - Quaoarians
Sedna - Sedn-asians (yes, send asians)
Krypton - Superman

Those are what I suggest.