Caelan \ca(e)-lan\ as a boy's name (also used as girl's name Caelan), is pronounced KAY-lan, SHAY-lin. It is of Gaelic origin. Possibly a contemporary variant of Cilean (Scottish). Cailean relates to Saint Columba (see Calum) as Crisdean does to Christ and Moirean to Mary.
For more information, see also the related name Kaelan.