We have made our first addition to the ballot. Vulcan is the Roman god of lava and smoke, and the nephew of Pluto. (Any connection to the Star Trek TV series is purely coincidental, although we can be sure that Gene Roddenberry read the classics.) Thanks to William Shatner for the suggestion!
Mr. Shatner's second suggestion, Romulus, has a bit of a problem because it is already the name of a moon. Romulus, along with his brother Remus, are the names of the moons of the asteroid 87 Silvia. They were discovered by a team led by my good colleague Franck Marchis, now a senior scientist at the SETI Institute.