Daddy was a big Elvis fan
Given name was Lisa Marie. Shortened to “L.M.” in high school. With the omnipresent southern drawl, most people in these parts call her Ellum.
Katrina identified a magical mark, a crescent moon, on her right hand, indicating her a member of the the Black Hand, a militant sect of the Sabbat
She also cast no reflection or shadow, pegging her as a Lasombra. (Or simply has the flaw)