I always loved the name Holly. Jasper and Jethro are so matchy-machy, not just in starting with the same letter but in general feel, that Holly makes a nice contrast.
I have a cousin named Holly Noelle; she was born around Xmastime, so that's how she came by the name, or at least the combo. That's about as themey a name as I'd ever want.
I think, therefore I judge.