Oh, goodness. You are going to be sorry you asked.
My Levi responds to: Levi, Levite, Leviticus, Leviathan, Lebite, Monkey, Monkey Man, Little Man, Little Bit, Bit Bit, Bittles, Bitty Boo, Boo, Hairy, Saggy Britches...and tons more too.
And probably most commonly, we call him Red, because his facial hair is reddish blonde.