Lennan is a very rare variant of Lennon that peaked in 2016 and has grown less common since.
Lennan is predominantly a girl name. In 2025 it ranked #14,188 for girl births in the United States (and #23,601 across all names), given to 6 babies. Lennan first appears in 2013 and peaked in 2016 (25 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 6 | 6 | #14,188 | — |
| 2024 | 11 | 11 | #9,298 | — |
| 2023 | 12 | 12 | #12,890 | #13,376 |
| 2022 | 10 | 10 | #10,104 | — |
| 2021 | 8 | 8 | #11,722 | — |
| 2020 | 11 | 11 | #9,276 | — |
| 2019 | 15 | 15 | #7,559 | — |
| 2018 | 10 | 10 | #10,237 | — |
| 2017 | 10 | 10 | #10,405 | — |
| 2016 | 25 | 25 | #5,397 | — |
| 2015 | 12 | 12 | #9,266 | — |
| 2014 | 9 | 9 | #11,525 | — |
| 2013 | 12 | 12 | #9,361 | — |