Any name that smacks of bad weather or dangerous animals should work fine. The Stormbringers or The Cobra Cell are suitable names. The second thing you need is a terrific logo. With computer graphics programs, anybody should be able to create a passable one these days. Again, weather and mean critters are both good bets.
Lightning bolts are a winner, as are snakes, wild felines and anything else with big teeth or venom.
Anything that terrifies someone who grew up in a city will do. If you choose this method, you should be able to turn out a passably disturbing brochure on your desktop computer or write a manifesto on your word processor. Or call radio talk shows, muttering nonsense. If you use any method that might expose your location or identity, you must either take precautions to disguise yourself or prepare for exposure. DO NOT make any threats, even fake ones.