What is Patrick's friend's name in real life?

You mean Danny Comden, who plays Stevie? Well, there you go! :)

One thought I'd like to add about Stevie: Anyone who's never seen "I'm With Her" before might think that Stevie is the typical cliched dumb sitcom character. To those folks, I say, pay attention: Stevie's not dumb at all, he's just very immature. Which makes him very funny! :lol: