Luminous Scimitar
Radiant Rapier
Bright Blade
Cosmic Cutlass
Fulminous Foil
You're all welcome to use these without fear of a lawsuit, at least from me anyway.
(When will people like Disney's legal department understand that things like light saber academies are just so much more free advertising and promotion for their movies? If it weren't Star Wars, there might be some actual cultural backlash to this kind of thing.)