As much as I agree that the name is cute, I also have to agree that it's a bit cliché. I'm quite sure that if Bella had wanted to, she could have come up with something less ridiculous, especially when it earned the poor girl the nickname 'Nessie'.
Theys hould have gone with carlie. Now they have a big family of unusual/old fashioned names. Mary-Alice, Jasper ( I have never, in my life, met someone named Jasper.), Rosalie...