In the middle ages a common diminuative of a name was to add -kin to it. I'd imagine that's how you get Frank from Francis, same as how you get Hank from Henry, Jack from John, Rick from Richard, etc.
I get a very similar underlying feeling from both names, so I guess I have no problem loving Frank as a nn for Francis! I think Francis feels much more formal and Frank is nice and rugged, and I like that there are both options with the same name.
This message was edited 10/18/2010, 11:42 AM