Correct Gaelic spelling: Ciarán. The 'fada' above the second a makes the vowel long thus resulting in an 'aw' sound. Hence correct pronunciation of the name becomes keer-on.
My younger brother was almost named Ciaran. My parents ended up changing it to Braden, though, because the nurses kept calling him Karen, and they worried kids would call him "Ciar the Queer".
This is such an interesting and Strong Masculine name, unusual, I love it!
-- Anonymous User 7/8/2010
While the proper pronunciation of this name is nice, Ciaran might be a difficult name to use in the US, as most people will want to pronounce it "Cee-AH-run" or "Cee-AIR-un".