I might have suggested before, but why not use a theme or target you demographic?
Themes could be birds, dogs, reptiles or any other 'group' (name of ghosts such as Wraith, as Crosslandkelly suggested). This might also help with marketing as you can have the bird range or bear range. Or to target a demographic, like young lads, go for butch names like ripper or overkill (not suggestions by the way), olde blokes might prefer less butch names and go for something either more bushcrafty or cerebral (like Umbra as TeeDee suggested)