Lachlan is an uncommon boys' name that has climbed to its highest level yet, peaking in 2025.
Lachlan is predominantly a boy name. In 2025 it ranked #606 among boys (468) and #10,536 among girls (9) — overall #1,210 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 477 | 477 | #10,536 | #606 |
| 2024 | 401 | 401 | #8,721 | #695 |
| 2023 | 349 | 349 | #7,108 | #771 |
| 2022 | 363 | 363 | #6,596 | #746 |
| 2021 | 374 | 374 | #6,551 | #726 |
| 2020 | 381 | 381 | #5,408 | #705 |
| 2019 | 386 | 386 | #6,899 | #690 |
| 2018 | 374 | 374 | #6,401 | #687 |
| 2017 | 373 | 373 | #6,184 | #699 |
| 2016 | 370 | 370 | #7,449 | #701 |
| 2015 | 328 | 328 | #7,133 | #767 |
| 2014 | 251 | 251 | #7,891 | #911 |
| 2013 | 216 | 216 | #9,957 | #976 |
| 2012 | 203 | 203 | #8,048 | #1,033 |
| 2011 | 186 | 186 | #12,828 | #1,062 |
| 2010 | 153 | 153 | #18,588 | #1,207 |
| 2009 | 164 | 164 | #9,731 | #1,188 |
| 2008 | 150 | 150 | #19,184 | #1,218 |
| 2007 | 130 | 130 | #16,643 | #1,357 |
| 2006 | 132 | 132 | #16,226 | #1,312 |
| 2005 | 116 | 116 | #11,413 | #1,396 |
| 2004 | 60 | 60 | — | #2,012 |
| 2003 | 65 | 65 | — | #1,831 |
| 2002 | 64 | 64 | #11,700 | #1,991 |
| 2001 | 46 | 46 | — | #2,231 |
| 2000 | 39 | 39 | — | #2,458 |
| 1999 | 39 | 39 | — | #2,318 |
| 1998 | 49 | 49 | — | #1,976 |
| 1997 | 30 | — | — | #2,654 |
| 1996 | 17 | — | #14,738 | #5,062 |
| 1995 | 17 | — | — | #3,780 |
| 1994 | 14 | — | — | #4,429 |
| 1993 | 13 | — | — | #4,598 |
| 1992 | 5 | — | — | #9,227 |
| 1991 | 6 | — | — | #7,828 |
| 1989 | 11 | — | — | #4,687 |
| 1988 | 8 | — | — | #5,493 |
| 1983 | 5 | — | — | #6,842 |
| 1982 | 7 | — | — | #5,349 |
| 1970 | 5 | — | — | #5,122 |
| 1964 | 5 | — | — | #4,355 |
| 1959 | 6 | — | — | #3,816 |
| 1956 | 5 | — | — | #4,222 |
| 1952 | 5 | — | — | #4,027 |