Declan Boy
How popular is Declan?
#139 boy name in 2025
2,570 baby boys were named Declan in the US in 2025, making it the 139th most popular boy name. Another 17 girls got the name (#6,545 for girls).
Declan popularity over time
Boys Girls
| Rank in 2025 | #139 for boys (▼ 7 from 2024) |
|---|---|
| Babies in 2025 | 2,570 boys, 17 girls |
| 10-year trend | Falling (-28% babies vs 2015) |
| Earlier ranks | #112 in 2015, #101 in 2020 |
| Peak year | 2019 (3,971 boys) |
| Highest rank | #95 in 2019 |
| First recorded | 1951 |
| Boys vs girls (last 10 years) | 99% boys, 1% girls |
| Chance a classmate shares it | 2% in a class of 25 kids born in 2025 |
Declan counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Declan family of names ranked #142 for boys in 2025 (#130 the year before), with 2,746 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Declan | 2,570 | 94% |
| Deklan | 57 | 2% |
| Deklyn | 28 | 1% |
| Decklan | 21 | 1% |
| Declyn | 22 | 1% |
| Deklin | 16 | 1% |
| Decklyn | 16 | 1% |
| Deklen | 11 | 0% |
| Declen | 5 | 0% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Declan is most popular
Babies named Declan per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
- Vermont: 6.7 per 1,000 (42 boys)
- Maine: 5.4 per 1,000 (105 boys)
- New Hampshire: 5.4 per 1,000 (119 boys)
- Wyoming: 4.8 per 1,000 (28 boys)
- Montana: 4.8 per 1,000 (85 boys)
Declan by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1950s | 27 | #3,504 |
| 1960s | 70 | #2,672 |
| 1970s | 53 | #2,890 |
| 1980s | 145 | #2,062 |
| 1990s | 1,135 | #568 |
| 2000s | 7,268 | #309 |
| 2010s | 31,107 | #95 |
| 2020s | 18,742 | #101 |
Boy names about as popular as Declan
Questions
- Is Declan a boy or girl name?
- Declan is mostly a boy name. Over the last 10 years, 99% of babies named Declan were boys.
- How popular is the name Declan?
- 2,570 baby boys were named Declan in the US in 2025, making it the 139th most popular boy name. Another 17 girls got the name (#6,545 for girls).
- When was Declan most popular?
- Declan peaked in 2019, when 3,971 boys were given the name. Its highest rank was #95 in 2019.
- How many people are named Declan?
- 58,950 babies have been named Declan in the US since 1880. We estimate about 58,503 of them are alive in 2026, with a median age of 9.
- Where is Declan most popular?
- From 2021 to 2025, Declan was most common in Vermont, at 6.7 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.