Declynn is a very rare variant of Declan that peaked in 2021 and remains in steady use.
Declynn is predominantly a girl name. In 2025 it ranked #9,610 for girl births in the United States (and #16,306 across all names), given to 10 babies. Declynn first appears in 2011 and peaked in 2021 (23 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 10 | 10 | #9,610 | — |
| 2024 | 16 | 16 | #9,077 | #12,758 |
| 2023 | 21 | 21 | #7,347 | #11,151 |
| 2022 | 22 | 22 | #6,790 | #12,787 |
| 2021 | 23 | 23 | #5,442 | — |
| 2020 | 19 | 19 | #8,084 | #10,926 |
| 2019 | 13 | 13 | #8,241 | — |
| 2018 | 17 | 17 | #6,875 | — |
| 2017 | 18 | 18 | #6,606 | — |
| 2016 | 21 | 21 | #6,027 | — |
| 2015 | 15 | 15 | #7,728 | — |
| 2014 | 15 | 15 | #7,765 | — |
| 2013 | 10 | 10 | #10,463 | — |
| 2012 | 8 | 8 | #12,513 | — |
| 2011 | 5 | 5 | #17,458 | — |