I can tell you for a fact how Will Smith got his moniker. Will Smith and I had the same algebra teacher, her name is Ms. Brown. Will used to be her favorite student, and I'm preety sure he still is. Well anyways, Mr.Brown called him Prince because he was just too good with the ladies, and I then one day he was acting smart/fresh in class, and Ms. Brown got mad, and she called him "Fresh Prince". So ever since then, he kept that name, and it sure made him a lot of money!
PS: I'm preety sure some idiot is gonna misinterpret this, so here's the disclaimer. JUST BECAUSE WE HAD THE SAME TEACHER DOESN'T MEAN WE WENT TO SCHOOL TOGETHER. HE GRADUATED IN THE 80'S. I GRADUATED IN 2002!!!!!