I'd almost be willing to lay odds that Kaylee's parents were fans of Firefly... heh..
though that brings up the topic of relatively obscure or unusual literary (or now days film/tv series) names...
I had a friend named Evenstar back in high school and, having been an avid bookworm since birth, i've read lots of character names over the years that were very lovely sounding and would definately not be on the "well there are seven kids with that name in the class" sort, and do have some sort of meaning to those who love the stories anyway... but, are also on the "well, it's a little bit out there..." list.... and even a few place names that would fit... (and, btw.. the name Angus has a lot more meaning and reference then just to beef... it's scottish, of course, and means "sole or only choice" and in celtic mythos, Angus Og was the god of humor and wisdom.)
(though I've always been of the opinion that if you want to do a weird name, that's fine.. just give them a "serious" name to go with it, so can go by the serious name at board meetings and such.. heh...)
I'm thinking of names like Amalthia, Tholden (i know.. it sounds like a soap opera name..), or unusual spellings of more common names