Quick answer
Declán is a boy name with Ireland roots meaning "good".
Pronunciation: English /ˈdɛk.lən/.
Meaning and history
Anglicized form of Irish Deaglán, Old Irish Declán, which is of unknown meaning, though it likely begins with the Old Irish prefix dag "good". Saint Declan was a 5th-century missionary to the Déisi peoples of Ireland and the founder of the monastery at Ardmore. In America, this name received boosts in popularity from main characters in the movies The Jackal (1997) and Leap Year (2010).
Notes and context
Usage: irish, english