Hey, it appears you're right! I looked up
Lucy, and it said that it's the English feminine form of
Lucius. And then I looked up
Lucille, and it said it's the French pet form of
Lucia. I guess my thinking was influenced by
Lucille Ball, whom we all know went by
Lucy. Well, I don't have a problem with
Lucy anymore, but as I'm not going to be having any more children, it's all academic.