Sha

“That your sister?” Newt looked at him in surprise. “That’s right. Her name’s Lizzy.” A long pause, during which his head sank until it rested against the window. “At least, it used to be. They may think they have us all brainwashed with our new names, but no way I’ll ever forget hers.” “What did they change it to?” Thomas asked. “Sonya.”
― James Dashner, The Maze Runner Series Complete Collection