The name Lizzie is a girl's name of Hebrew origin. Lizzie and is often added to lists like Nicknames for Elizabeth and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Lizzie was commonly used as an independent name in the last half of the nineteenth century. Today Lizzie is still one of the most stylish short forms of Elizabeth, but few U.S. parents put it on the birth certificate.