In the previous theory, I said that Han and Leia are Rey's parents. If they are not, or you don't like that theory, you may like this one (especially Reylo shippers)

Many people ship Rey and Kylo. If you take "Rey" and "Ben" (Ben Solo), and put it together to make a ship name you get.....wait for it...... REN. KYLO REN. ILLUMINATI CONFIRMED. These two were obviously meant to be.