Boys' name · peaked in 2019
Declan name popularity since 1925
58,950 babies born in the US from 1925 to 2025 were named Declan (0.7% girls, 99.3% boys). Half of them were born in 2017 or earlier, so the typical Declan is about 9 years old in 2026. Declan peaked in 2019 as the #95 name for boys, and it ranked #139 in 2025.
Key facts
- US babies since 1925
- 58,950
- Named Declan, 1925–2025
- In 2025
- #139
- for boys in 2025 (2,570 babies)
- Girls / boys
- 99.3% boys
- 403 girls · 58,547 boys
- Most popular in
- New Hampshire
- 2.60× its national share
Peak year is the year Declan made up the largest share of US boys, in records going back to 1880. Typical age is based on births from 1925 on, not on who is living today.
Declan births per year, 1925–2025
2019 was the biggest year for Declan both by count and as a share of all babies.
- Fastest rise: Between 1996 and 2001, Declan became 4.9× more common, from 1 in 18,000 baby boys to 1 in 3,660.
Shaded on the chart. This compares Declan's share of all US boys five years apart, counting only years with at least 100 babies named Declan.
Decade by decade
Babies named Declan in each decade, and its rank among boys' names in the middle year of the decade (1935, 1945 … 2025).
| Decade | Girls | Boys | Rank |
|---|---|---|---|
| 1925–29 | 0 | 0 | – |
| 1930s | 0 | 0 | Under 5 |
| 1940s | 0 | 0 | Under 5 |
| 1950s | 0 | 27 | #3,585 |
| 1960s | 0 | 70 | #3,312 |
| 1970s | 0 | 53 | #4,040 |
| 1980s | 0 | 145 | #3,105 |
| 1990s | 0 | 1,135 | #1,208 |
| 2000s | 12 | 7,268 | #353 |
| 2010s | 229 | 31,107 | #112 |
| 2020–25 | 162 | 18,742 | #139 |
Ranks count every name given to at least 5 boys that year, so they can go past 1,000. "Under 5" means fewer than 5 boys got the name.
Generation fingerprint
74.6% of babies named Declan from 1925 to 2025 were born in the Gen Alpha years (2013–2025). The full split by generation:
Where Declan is most popular
The index compares Declan's share of babies in each state with its share nationwide, 1925–2025 (1.50× = 50% more common). States with at least 300 babies named Declan.
| State | Index | Babies |
|---|---|---|
| New Hampshire | 2.60× | 476 |
| Idaho | 2.33× | 539 |
| Colorado | 2.01× | 1,444 |
| Massachusetts | 1.81× | 2,506 |
| Nevada | 1.81× | 375 |
Other spellings
Spellings that sound like Declan and were given to at least 1,000 boys from 1925 to 2025, with the year each one was most popular.
| Spelling | Boys | Peak year |
|---|---|---|
| Declan (this page) | 58,547 | 2019 |
| Deklan | 2,484 | 2018 |
Names with a similar story
Of the other 1999 names on this site, these six had the share of babies closest in shape to Declan's from 1925 to 2025, however common each one got. Each line is scaled to its own high; the dashed line is Declan.
Names from the same era
Other common names that peaked within two years of Declan (2019).
Source: U.S. Social Security Administration national and state baby-name data, which covers names given to at least 5 babies of one sex in a year. About the data