Kaizen is an uncommon variant of Kasen that peaked in 2025 and remains in steady use.
Kaizen is predominantly a boy name. In 2025 it ranked #364 among boys (895) and #16,037 among girls (5) — overall #713 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 900 | 900 | #16,037 | #364 |
| 2024 | 617 | 617 | #10,661 | #502 |
| 2023 | 492 | 492 | #16,316 | #588 |
| 2022 | 257 | 257 | — | #903 |
| 2021 | 158 | 158 | — | #1,220 |
| 2020 | 110 | 110 | #12,769 | #1,584 |
| 2019 | 86 | 86 | #16,713 | #1,858 |
| 2018 | 78 | 78 | — | #1,908 |
| 2017 | 63 | 63 | — | #2,160 |
| 2016 | 51 | 51 | — | #2,494 |
| 2015 | 56 | 56 | — | #2,334 |
| 2014 | 42 | 42 | — | #2,831 |
| 2013 | 34 | 34 | — | #3,233 |
| 2012 | 26 | 26 | — | #3,949 |
| 2011 | 19 | 19 | — | #4,904 |
| 2010 | 15 | 15 | — | #5,889 |
| 2009 | 18 | 18 | — | #5,205 |
| 2008 | 18 | 18 | — | #5,168 |
| 2007 | 11 | 11 | — | #7,344 |
| 2006 | 5 | 5 | — | #13,009 |
| 2005 | 8 | 8 | — | #8,703 |
| 2004 | 6 | 6 | — | #10,656 |