Keylen is a rare variant of Kellen that peaked in 2013 and remains in steady use.
Keylen is predominantly a boy name. In 2025 it ranked #4,957 among boys (20) and #16,152 among girls (5) — overall #8,953 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 25 | 25 | #16,152 | #4,957 |
| 2024 | 26 | 26 | #8,200 | #6,658 |
| 2023 | 26 | 26 | #10,763 | #5,577 |
| 2022 | 19 | 19 | #12,932 | #7,047 |
| 2021 | 15 | 15 | #10,710 | #11,492 |
| 2020 | 20 | 20 | #9,246 | #8,420 |
| 2019 | 18 | 18 | #10,930 | #8,557 |
| 2018 | 15 | 15 | #11,980 | #10,240 |
| 2017 | 18 | 18 | #9,634 | #10,271 |
| 2016 | 20 | 20 | #13,645 | #6,551 |
| 2015 | 18 | 18 | #17,857 | #6,534 |
| 2014 | 29 | 29 | #9,861 | #5,172 |
| 2013 | 39 | 39 | #6,366 | #4,896 |
| 2012 | 29 | 29 | #11,773 | #4,796 |
| 2011 | 37 | 37 | #6,733 | #5,099 |
| 2010 | 28 | 28 | #8,982 | #5,905 |
| 2009 | 35 | 35 | #7,201 | #5,439 |
| 2008 | 30 | 30 | #6,946 | #7,480 |
| 2007 | 34 | 34 | #8,795 | #4,730 |
| 2006 | 30 | 30 | #11,954 | #4,436 |
| 2005 | 20 | 20 | #9,176 | #8,736 |
| 2004 | 23 | 23 | #10,312 | #5,995 |
| 2003 | 13 | 13 | #17,105 | #8,267 |
| 2002 | 13 | 13 | #12,944 | #10,100 |
| 2001 | 5 | 5 | — | #11,542 |
| 2000 | 9 | 9 | — | #7,139 |
| 1999 | 5 | 5 | — | #10,840 |
| 1998 | 5 | 5 | — | #10,518 |
| 1997 | 5 | — | — | #10,083 |