Finer details of demonology

Nunn: If Satan really possesed Emily Rose... Wait. Wasn't he called Lucifer before the fall?
Silliman: Yeah.
Nunn: So if he's calling himself Lucifer then like he's not really.
Silliman: Well he might still call himself Lucifer.
Nunn: Shit, I thought I had him.
Silliman: You gotta remember, Lee, he's the Father of Lies.
Nunn: Damn.