A word-related note:
http://www.cnn.com/2001/TECH/space/12/28/nixed.moon.ap/index.html: A space rock just 25 miles across has failed to win recognition as the 21st moon of the planet Uranus. ... Uranus has 20 confirmed moons that all take their names from characters in the works of William Shakespeare and Alexander Pope.

http://wwwflag.wr.usgs.gov/USGSFlag/Space/nomen/nomen.html, gives the names and sources, per the International Astromonmical Union. (click to Appendix 7). By the Union's convention, all features on these satellites (craters, etc.) are to be named after such characters, places, or spirits. (same site, Appendix 6)