Declan: Meaning, origin and popularity

Pronounced DEK-lun · 2 syllables

Declan means “full of goodness”, from Irish.

From Old Irish Declan, whence the modern Irish equivalent Deaglan.

How popular is Declan?

Declan was the #139 name in the US in 2025, given to 2,587 babies. Its use has been fairly steady over the last decade. It peaked around 2010.

Babies named Declan in the US by five-year period, relative to its peak (around 2010).

Half of US adults named Declan are older than 22; most are between 18 and 34. (Estimated from US births by year and life tables.)

Names that real brothers and sisters of people named Declan have, from family records on Wikidata, most common first.

Chosen by the same families or with a similar style and era.

Declan means “full of goodness”. It comes from Irish.

Declan is pronounced DEK-lun.

Declan was the #139 name in the US in 2025, given to 2,587 babies. Its use has been fairly steady over the last decade. It peaked around 2010.

Half of US adults named Declan are older than 22. Most are between 18 and 34.