When we were still finding planets, the body in charge of naming celestial objects was the International Astronomical Union (IAU). If an astronomer discovers an object, or wants to name a surface feature, they can submit a suggestion to the IAU. The IAU then can either approve it or suggests a different name. Since it appears that there are no undiscovered planets, the IAU focuses on the naming of moons, surface features, asteroids, and comets.