Small quibble... It's Johns Hopkins, not John Hopkins.
Must have been fun to be that guy, "it's Johns, not John..." But when you're as rich as that guy was, it probably sailed right past him. He was a great philanthropist, and probably didn't worry much about it.
He got it from his great grandmother, Margaret Johns, who decided to name her son after her maiden name (and who, really, doesn't do that? "hi, my name is McGillicutty Jones"), and Johns' parents passed it down to him.
OK, enough trivia, on with the show!
I smoked pot with Johnny Hopkins