From the experts:
Nimue (Lady of the Lake) is the ruler of Avalon in the Arthurian legend. Nimue plays a pivotal role in many stories, including giving King Arthur his sword Excalibur, enchanting Merlin, and raising Lancelot after the death of his father. Always an unusual choice, this name went to three magical girls in England and Wales in 2013. Related names include Nimue, Viviane, Vivien, Elaine, Ninianne, Nivian, and Evienne.