Good points, all.
If you’ve got your own moon, you’re a planet, dang it!!!
According to the Wikipedia article on Pluto, Percival Lowell's widow Constance first proposed the name "Zeus" for the newly-discovered object, then "Percival," then "Constance." The name Pluto was first proposed by an 11-year-old English girl named Venetia Burney, whose grandfather's brother was the person who came up with "Phobos" and "Deimos" for the moons of Mars.