If they don't have a vehicle named "Serenity" at some point we are going to have a serious problem.
> Firefly is an American space western drama television series [...] The series is set in the year 2517, after the arrival of humans in a new star system, and follows the adventures of the renegade crew of Serenity, a "Firefly-class" spaceship.
That said, I doubt one could call such a company "Harry Potter's Wizardly Rockets" without receiving a lawsuit, but I suspect such claims would be based on copyright.
1. http://tmsearch.uspto.gov/bin/showfield?f=toc&state=4804%3A4...
I can imagine they'd want to tread lightly and not name one of their spaceships after a spaceship on the show Firefly.