When I was installing FFXI for the first time, I had troubles deciding what to name my character. I was listening to a Death Cab for Cutie album pretty incessantly. I figured Guenivere was a good of a name as any, and took the spelling from the CD booklet. Most people ingame called me Guen or Guenny so there's the Alla handle.
As far as my real name, my parents both claim it was solely their own idea to name me Jade, and with completely differently inspirations. My mom says she named me after Brooke Shields' character in Endless Love (which I believe somewhat because she named my littlest sister Amaya after a Real World character), and my dad claims that he got to pick my name because throughout the pregnancy they thought I was a boy. My maiden name was purely Danish, and now it's Norwegian.... yay.
And as far as my catholic confirmation name, I chose Alice, which is my grandma's first name, but she hates that name and goes by her middle name, which is Joyce. Hopefully now that I'm married the USPS will stop getting us confused (though I'm sure I'll continue getting "try this prototype hearing aid for free!" and other AARPish mail forever).