My Digital Media Entrepreneurship group from used a Stanford d.school technique to brainstorm 100 possible names for our product, organize them by theme and then cut them down to the final four, all in under 10 minutes. Here are two quick photos of the process.
Then we all simultaneusly organized them by theme, or, at least, themes we each individually saw. Then everyone picked their 4 faves, and we took them off, debated and settled on the four we would research for feasibility. Done and done.