I was about to vote for Cillen-Cillian at first because I like the something-ian names, but then I continued reading your post to the end and then you speak of the name meaning, so OK, I did a reason vote and it went to the same result, I voted Cillen-Cillian.
So, now I know what to do with my people of the Summers house in the Sims. I was bored of them. Now all I have to do is to introduce an elf in the neighborhood, make him marry Willow and buy them a kid (yeah, it's way too long to have one the normal way or wait for the adoption services to call, so I downloaded the 600§ baby :D )