There are plenty of bad ride names I can think of, can't decide an absolute worst, though:
Diving Coaster: Vanish
Bizarro
Smiler
Sooperdooperlooper (Makes it sound a bit like a kiddie ride for a looping coaster)
Cocoa Cruiser
Great Pumpkin Coaster
Lucy's Crabie Cabbie
Scream! (Not very original)
Dog Fart Coaster (This could be a contender for the worst name)
10 Inversion Coaster (A lot of Chimelong Paradise's coasters count also)
Every Rollercoaster at Yomiuriland except for Bandit
Also, as an honorable mention: Rollercoaster. You can't get any more generic than that. I can understand older rides having that name as it could have been the only coaster in the park, but I don't see any reason for new rides to have that name.
EDIT: I forgot YOLOcoaster