Steve's

The Crocodile hunter was Steve Irwin's nickname

Steve Leonard (his nickname Steve leopard) was Darren's best mate @ the cirque du freak show Steve sees mr crepsley and recognises him from a book he had read, after the show Steve went to mr crepsly and asked to be a vampire, mr crepsley turns him down, later in the series Steve gets bitten by mr crepsley's spider that Darren stole and Darren becomes a vampire to save Steve's life, Steve doesn't see it that way and they become enemies.

No Steve Lovell is not a astronaut, only has the same name.

Steve Wozniak created the first Apple computer.