Thinking of a space based game???
You got my interest!!!
Standard for uninhabited worlds is
StarName Number
IE: Sol 3 (Earth)
Here are a few pointers:
https://en.wikipedia.org/wiki/Planets_in_science_fiction Several links to other articles...
http://www.scifiideas.com/planet-generator/ This one generates a random name with planet details...
I really love this name generator site: http://fantasynamegenerators.com/planet_names.php#.WHmPivkrL4Y
I use it for most of the MMORPG's I play. =)
