Kaii is a very rare variant of Kai that peaked in 2019 and remains in steady use.
Kaii is predominantly a boy name. In 2025 it ranked #8,577 for boy births in the United States (and #17,782 across all names), given to 9 babies. Kaii first appears in 2001 and peaked in 2023 (17 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 9 | 9 | — | #8,577 |
| 2024 | 8 | 8 | — | #9,415 |
| 2023 | 17 | 17 | — | #5,570 |
| 2022 | 13 | 13 | — | #6,653 |
| 2021 | 8 | 8 | — | #9,246 |
| 2020 | 7 | 7 | — | #10,066 |
| 2019 | 18 | 18 | #14,629 | #6,979 |
| 2018 | 12 | 12 | — | #6,911 |
| 2016 | 6 | 6 | — | #11,417 |
| 2015 | 6 | 6 | — | #11,385 |
| 2014 | 5 | 5 | — | #13,049 |
| 2013 | 5 | 5 | — | #13,082 |
| 2001 | 5 | 5 | — | #11,459 |