I was friends with an
Amanda whom I always called
Amanda and so did everyone else whom both she and I knew. When she took me to visit her relatives, I heard them call her "
Mandy" and that's when I realized that as a child she had been called that. Evidently, she chose to change that as an adult. It was pretty jarring to hear her called "
Mandy", to tell the truth, I didn't think of her that way and she just didn't seem like a
Mandy. Anyway, an example of how it's possible for a
Mandy to become an
Amanda.