I once changed someone's name in high school... I was a junior and I accidentally referred to a freshman I was on stage crew with by the wrong name. I refused to admit my mistake and it stuck -- for the rest of his high school career, Ryan was called Andy.
outside of that, no. I generally call people by whatever name they prefer to be called (unless they're a real dick about it... I used to work with a Johnathan who would hyperventilate anytime someone called him John.)