Meaning & origin
Where it comes from
A possible origin is Irish, although the derivation remains uncertain.
How it developed
In Irish use, Declan is used as a form of Gaelic.
The story
Published U.S. birth records include this spelling as early as 1951. This is the earliest published observation available here, rather than a date for the name’s origin.
From dated birth records
Declan through the years
- Babies since 1880
- 58,950
- 58,547 boys · 403 girls
- Most popular year
- 2019
- 4,007 babies
- 2025
- 2,587
- #139 for boys · #6,606 for girls
- 2021–25 vs 2016–20
- −18%
- Easing
Where it’s given
By the numbers
In 2025, this name appeared in 2,570 U.S. birth records for boys, ranking No. 139 among boys’ names. Average annual use for boys was 18.1% lower in 2021–2025 than in 2016–2020. Its largest published annual count for boys was 3,971 in 2019. It also appeared in 17 birth records for girls in 2025. In 2025, Texas had the largest reported state-level birth count for boys with this name (158). Published U.S. population figures for this spelling include 39,020 as a first name in 2020.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Declan’s family of names
In English usage, Declan has a diminutive in DEC. In English usage, Declan has a conventional equivalent in the Irish form Deaglán. In English usage, Declan has a short form in DEC.
Inner ring: spellings · middle: nicknames and forms · outer: across languages.
Around the world
Declan has relatives in 4 languages. Lines run from its Irish roots to each of them.
Irishwhere Declan comes from · 1 name
Nicknames & forms 2
Diminutives, pet forms, short forms and variants used alongside the name.
Spellings & scripts 1
The same name written differently, including transliterations into other scripts.
Across languages 3
Equivalents and cognates in other languages, plus older forms it grew from.
People named Declan
- Declan RiceEnglish footballer (born 1999)
- Elvis CostelloEnglish singer-songwriter (born 1954)
- Declan GalbraithEnglish singer, actorborn 1991
- Declan JohnWelsh footballer (born 1995)
- Declan GallagherScottish association football playerborn 1991
- Declan RuddEnglish association football playerborn 1991
- Declan McKennaBritish musicianborn 1998
- Declan HillCanadian journalist and authorborn 2000
- Declan DonnellyEnglish television presenter (born 1975)
Listed by how widely each person is written about, which says nothing about the name itself.
Similar names
If you love Declan, these share its style, era, origin or sound, from outside its own family.
Kieran
“having dark features; the little dark one”
97% boys · 3% girls
Finn
“white, fair” · “one who is cool”
99% boys · 1% girls
Killian
“a warrior woman; of the church” · “one who is small and fierce”
98% boys · 2% girls
Aidan
“one who is fiery; little fire” · “a fiery young man”
99% boys · 1% girls
Cormac
“a charioteer”
>99% boys
Gareth
“one who is gentle”
>99% boys
Angus
“one force; one strength; one choice”
>99% boys
Colmán
“dove”
>99% boys