Killian

• because it's different.  It's not going to ever be in the top 100 names(top 1000 for that matter!) and it's never going to go to the girls.
• a very outgoing young lad I met in Dublin

This is an anglicization of the old Irish name Cillín or Cillian, which is may be derived from the word for "cell; church." It also may come from a word meaning "strife."
See Also: Kilian.