The challenge of naming a child

This one is going to be short and I apologize, but I've had this one bit on my mind for a while now.  Erin and I have been going back and forth on names for our daughter.  We suggest different things, but we have mostly been debating between two names.  And, for those of you who are wondering, I won't be revealing the names here.  We have decided that we won't tell anyone the name we picked out until it is already on the birth certificate.

So, we have these name ideas that we have come to after lots of discussion, but how do you tell which one is the right one?  Does anyone out there have a good way of determining what to name a child?  Maybe there is something out there that we haven't considered.