Question: how rey is a skywalker?
Answer: In The Rise of Skywalker, it is revealed that Rey is the granddaughter of Palpatine (also known as Darth Sidious). After the defeat of the Sith lord, Rey travels to Tatooine. There, in reflection and response to an appearance from a reunited Luke and Leia as Force spirits, she declares her name to be Rey Skywalker.