I don't know why it took me so long to notice this over at ABC.com, but they've got an official Sawyer Nickname Generator up that's a quick, silly timewaster; they only ask for input based on six criteria and it spits out multiple nicknames for the same input. In addition to the "Bubblehead" screen cap below, I also got "Cotton" and "Chewie," none of which I think the writers would have come up with if I happened to be a character on the show. Heck, I had more creative "nicknames" in high school! I think we need Version 2.0 here, along with an instant graphic you can post on your blog. =)
Anyhoo, try it out and let me know what you get.