Hm...for a fast guy you could go with Gusto, or maybe Sverre (Norse for 'wild and restless'). Maybe-
Oberon (king of the Faerie)
Baldur (or Baldar, or Baldr the Brave) Norse god
so many choices! I'm sure anything you pick will fit him well. I have a little purple guy that's been nameless for two weeks, and my boy Rudis didn't get a name for a month. He went by Little Blue Fishy. But it was worth the wait.