Declan, the amiable and appealing name of an Irish saint (and the real first name of singer Elvis Costello), is very popular in the Emerald Isle and beginning its certain climb to popularity here, already at Number 143, after debuting on the American list in 1998--it climbed 33 places in 2012. Like Aidan and Liam, Declan is shaping up to be an American hit.
St. Declan of Ardmore was a very early Irish missionary, preceding St. Patrick. Declan Porter is a current character on Revenge.
Cyndi Lauper spelled her son's name Declyn.