Caitlin, Cathleen: Pronounced Koit+leen, Kath+leen (the Irish form of St. Catherine)
Although not an Irish saint,
St. Catherine of Alexandria was hugely influential among Irish Christians. Born around 287, Catherine had a vision of Mary at the age of 15 and converted to Christianity. With her powerful words, she converted many pagans, enraging the emperor Maxentius. Legend has it that when she was sentenced to death by being stretched on a wheel, the wheel broke as soon as she touched it. Catherine was martyred in 305
, and her devotion to Jesus continues to be an example to Catholics all around the world
, hence her special mention here.