What is the name of Luke Skywalker's twin sister in "Star Wars"?

Luke Skywalker's twin sister in "Star Wars" is Leia Organa. She is introduced as Princess Leia of Alderaan, a leader in the Rebel Alliance and one of the trilogy's central heroes.

Leia and Luke are the biological children of Anakin Skywalker and Padmé Amidala. They were separated after birth for protection: Luke was raised by relatives on Tatooine, while Leia was adopted by Bail and Breha Organa of Alderaan. Her royal title comes from her adoptive family, not her birth parents.

The sibling connection is revealed in "Return of the Jedi" (1983), when Luke learns that Leia is his twin. Padmé is her biological mother, so Padmé Amidala is not Leia's sister. Rey Skywalker is also not Leia's sibling; Rey is a later-generation character connected to the Skywalker family through different relationships.