Cylan kind of reminds me of Cylon - the robot creatures from Battlestar Galactica.
Have to admit, Battlestar Galactica was what immediately came to mind when I saw this name written down too. Speaking of which, what about Starbuck for a name. Now he was a pretty cool dude ...

I like Cylan with a hard C, like Ky-lan. It's not really what you're asking but just my 2c worth. Good luck with the baby naming - by the time we got to our third boy we were almost out of inspiration, and he ended up being named after a kids' cartoon racing car ... and it suits him