Declen is a very rare variant of Declan that peaked in 2015 and has since faded.
Declen is a boy name. In 2025 it ranked #12,477 for boy births in the United States (and #25,694 across all names), given to 5 babies. Declen first appears in 2011 and peaked in 2015 (11 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 5 | 5 | #12,477 |
| 2022 | 10 | 10 | #7,898 |
| 2020 | 5 | 5 | #12,487 |
| 2019 | 5 | 5 | #12,606 |
| 2018 | 8 | 8 | #9,025 |
| 2017 | 6 | 6 | #11,089 |
| 2016 | 8 | 8 | #9,043 |
| 2015 | 11 | 11 | #7,177 |
| 2014 | 6 | 6 | #11,053 |
| 2013 | 8 | 8 | #8,983 |
| 2012 | 5 | 5 | #12,707 |
| 2011 | 5 | 5 | #12,733 |