Is Kayn from Full Metal Alchemist?

I've literally only watched two episodes so far as I wanted to go back to it since I used to watch it w/ my brother. But in the second episode, a girl named Rose, used to have a boyfriend named something that was close to sounding like Kayn. But they never truly showed him, at least not yet in the series. Did the league team use this character to create him into what he was like when he was alive as their own character?