Why does it seem so hard to name baby #3?

Melissa
With my first two I had their names picked out before 20 weeks. I'm currantly 25 weeks with a little girl and we can't pick a name! We have a few that we each like, but we can't seem to get together on this one. My oldest daughters name is Briana Rayne and my son is Landon David. We like less common names, but nothing to crazy. Any suggestions?