'Star Wars': Who Is Rey's Mom? Big Money Hint Uncovered

The biggest mystery in the 'Star Wars' galaxy -- the identity of Rey's parents -- was partially and accidentally leaked by Lucasfilm lawyers ... at least that's how super fans will see it.

Lucasfilm just filed docs, obtained by TMZ, to own all merchandising rights for a character named Jyn Erso -- specifically for toys, clothing, footwear, books, school supplies, and stationery.

The filing happened one day after the trailer for "Rogue One: A Star Wars Story" dropped ... introducing Jyn as the main character in that prequel.

Now, the connection to Rey -- the heroine of 'Force Awakens.'

'Star Wars' geeks immediately spotted similarities between Jyn and Rey -- facial features, British accents, and generally being kick-ass chicks. So, with the rumor mill already buzzing ... you know how this merchandising move looks.

Jyn's gonna be a big player ... and there's no bigger role than birthing Rey.