Ben nodded as Luke commented on the name. He had thought the same thing, though he didn't voice it aloud. "Interesting. This Leia, do you know if she is from before or after that trip?" This Leia seemed to not know much if anything about her parentage. Ben suspected she had yet to visit the planet, or else she had learned nothing about her family in her travels there.
"Hmm...." He thought over how their lives must have played out. It was clear he'd separated them for a purpose- likely to protect them from their father. Staring at Luke for a moment, Ben smiled and nodded. "I am sorry you could not have been raised together. It was too dangerous." He already knew his reasoning.
"I must have stayed on Tatooine to keep watch over you. And Leia's father...the Organas would have done the same and likely reported back to me on her growth." Ben already understood why and how this would have worked. But when Vader blew up Leia's homeworld...that changed things.
"Your father...Vader, does he know who you are? That you and your sister are alive?"