White House

What's in a Bush nickname?

Almost missed this during the course of talking about torture as an American institution this week (Washington Post):

Meanwhile, if the committee won't ask Gonzales about the curtain, perhaps it can inquire as to why President Bush calls him " Fredo"? Bush famously nicknames everyone, but Gonzales's name is Alberto. Gonzales is said not to know why he is called "Fredo."

Is it Fredo from "The Godfather"? That's weird.