Watching T.V. today I saw a boy named Kalen (KAY-len). I didn't see the spelling, but I'm guessing this is the correct because it is on the popularity charts for boys,
http://www.behindthename.com/top/search.php?terms=kalen
So, what do you think of Kalen on a boy? I wouldn't use it because I still find it trendy, I just thought it was different to see it on a boy instead of a girl.