My first instinct was to say kah-te-LEEN, but then I immediately thought, oh, maybe it's supposed to be like Caitlin
. I think kah-te-LEEN makes more sense, but I've seen so many different spellings of Caitlin
that's it isn't really a stretch to say it that way. I think Catelin would encourage more people to say it right the first time though.
My favourite spelling is Caitlin
. It's simple and straightforward. I can think of 8 (various spellings), aged 17-26, off the top of my head. Pretty common in my age group.
Theoretically, of course, it could all be an elaborate conspiracy.