I keep finding myself daydreaming about having DD3 just so I can call her Tess Rebecca. Would that be such a bad reason to have a 3rd child? 
DH hated Tess, and it didn't work with the middle name we had chosen anyway (MIL's name) so DD2 ended up with a name that both me and DH liked. It suits her, and I can't imagine her with another name (Meredith by the way) but I still find myself pining for a baby Tess 7 months later!
I even picked up a book in Waterstones today and actually didn't buy it as the main character was called Tess, and I knew it would make me sad.
DH says it's a dog's name and anyway we're not having any more kids, but if I really want I can buy a dog and call it Tess.