Koi is a rare variant of Koa that has climbed to its highest level yet, peaking in 2023.
Koi is predominantly a boy name. In 2025 it ranked #3,061 among boys (40) and #2,207 among girls (84) — overall #3,064 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 124 | 124 | #2,207 | #3,061 |
| 2024 | 103 | 103 | #3,034 | #2,693 |
| 2023 | 127 | 127 | #2,479 | #2,460 |
| 2022 | 107 | 107 | #3,626 | #2,259 |
| 2021 | 119 | 119 | #2,621 | #2,516 |
| 2020 | 81 | 81 | #4,123 | #2,678 |
| 2019 | 72 | 72 | #4,303 | #3,080 |
| 2018 | 66 | 66 | #4,407 | #3,338 |
| 2017 | 51 | 51 | #5,257 | #4,046 |
| 2016 | 46 | 46 | #6,557 | #3,935 |
| 2015 | 40 | 40 | #6,864 | #4,480 |
| 2014 | 56 | 56 | #5,897 | #3,274 |
| 2013 | 60 | 60 | #5,225 | #3,240 |
| 2012 | 40 | 40 | #8,039 | #4,081 |
| 2011 | 54 | 54 | #8,434 | #2,933 |
| 2010 | 54 | 54 | #6,523 | #3,278 |
| 2009 | 30 | 30 | #11,112 | #4,850 |
| 2008 | 38 | 38 | #9,270 | #4,095 |
| 2007 | 28 | 28 | #10,508 | #5,332 |
| 2006 | 34 | 34 | #8,066 | #4,788 |
| 2005 | 22 | 22 | #13,790 | #5,453 |
| 2004 | 20 | 20 | #15,181 | #5,656 |
| 2003 | 21 | 21 | #10,897 | #6,086 |
| 2002 | 23 | 23 | #10,692 | #5,281 |
| 2001 | 19 | 19 | #12,797 | #5,878 |
| 2000 | 9 | 9 | — | #7,148 |
| 1999 | 13 | 13 | #15,713 | #7,548 |
| 1997 | 10 | — | — | #5,900 |
| 1996 | 8 | — | — | #6,847 |
| 1995 | 7 | — | — | #7,437 |