Meaning
Declan is a irish name meaning “Full of goodness”.
History
An anglicised form of Deaglán, the name of an early Irish saint said to have preached in Waterford before the arrival of Patrick. Declan crossed into wider use in the late twentieth century and reads as both traditional and fresh.
Popularity
Ranked #58 in 2026 · up 452 places since 1996
Lower is more popular. Ranks are illustrative directory data.