I need a thief name for a main character.?

The character's name is Morwen which is elvish for 'Daughter of the dark'. She has midnight black hair, deep blue or brown eyes and pale skin. During the day she is a healer and the daughter of a powerful man but by night she turns thief…. I need a name for her thief form and that people will remember. One that show her grace and skills but also her beauty. I have looked on serendipity and severn sanctum but I can't find anything that fits…. :D thanks guys :D