I'm Writing a Harry Potter fan fiction, please help?

What I need help with, mostly, is on the main character's name. She lives with her "uncle and aunt" after her "grandmother's" death. They don't much fancy her and abuse her. At the beginning of the story, she has a different name: Ella. Which is just her decoy name so that she doesn't find any records of her real birth. She believes that her birth parents were murdered by Voldemort when she was just a baby, but when in reality she was given up, not willingly, by Lucius and Narcissa Malfoy when Narcissa gave birth to twins, Draco and Ella (whose real name isn't Ella.) and the whole time, her life has been a lie. Her grandmother wasn't really her real grandmother, and her adoptive parent's aren't really her aunt and uncle. But they are friends with Lucius and Narcissa, and all the years they've been visiting them for dinner parties and such, they see their daughter, but have no idea. Her adoptive parents do, though. So, what I'm trying to ask is: What should her real name be? Something...unique like Draco's, preferrably. :)