I like
Alexander as a MN, but it is terribly boring with
Robert. I'm on the fence about
Robert as a name.
Bob is entirely too cutesy as a NN, but
Rob seems cocky and annoying to me, but
Robert begs a NN. I prefer it without one, though.
Robert Luther has a lot more character than
Robert Alexander. I am friends with a
Robert Lamar. (Or maybe it's
Lamont? I don't remember, but he hates it haha.)