Today's name: Elsa
Potential nicknames: Elsie, Ells, Ellie, Elle, Ella, Elyse, Sia
Origin: (1) A pet form of Elizabeth turned independent. As such, it is Hebrew, meaning "God is my oath."
Popularity: Elsa has been popular in Sweden - in 2006 it ranked #16. In 2010 it ranked at #484 in the U.S., and in 2011 it was #578.
Fun fact: Elsa was the name of a lioness in the novel Born Free.