My youngest son's name is Landon and I sometimes call him Landy, but the name that he is called the most came from my oldest son. He was two when he was born and when he first saw him at the hospital, he told his daddy "Oh a B-Doll (baby doll). So that name has stuck with him, people tell me he will hate us for that one day.
My other son is Hunter Bunter and my dad sometimes calls him Cooter.
When I was growing up, and even now sometimes, my uncle calls me Olive Oyl (my first name is Olivama).