I just recently watched ALL the Star Wars movies, and then I watched the new one in theaters, and I have a theory about who Rey is. (I’m sure a lot of people do) Ok, her goes.
I think that Obi Wan Kenobi got married and had a daughter. Since he was so strong in the force, she was also quite strong in the force. This daughter got married to Luke Skywalker. The two of them had a daughter, and since both of her parents were strong in the force, so was she! Her name was Rey.
Anyway, it might be lame, but I’m stuck on it. If you have theories, please comment them 🙂