The latest PostSecret has the following true confession:

Ahhh, a riddle! 

Assuming the daughter's name isn't God of Thunder, there were two possibilities that came to mind. 

The first is the Kiss classic Beth, a derivative of the Hebrew Elisheva, or Elizabeth, popularly translated as consecrated to God. 

Another candidate is Shandi (from Shanti?), which doesn't refer to a biblical concept per se but whose folk etymology claims an origin in an unspecified foreign term for God is gracious. 

I probably missed one, so if you have a better idea feel free to shout it out loud.