Name help!

[mamakimi.livejournal.com]

I'm trying to figure out the correct spelling for a name I really love. My pregnant brain is failing at Google right now so bear with me!

I love the name Kirsten. Pronounced with a Ker (rhymes with her) at the beginning. I THOUGHT that was the correct spelling until I ran into a girl at GAP with the same spelling but pronounced with "ear" sound after the K.

Am I making any sense here? Being pregnant has totally made my brain leak out my ears. lol

Which is right? Are there other spellings? I don't want to spell my child's name wrong (if I have a girl). lol