Is Koi a boy or girl name?
Koi is used for both boys and girls in close to equal numbers in the US. In 2024, 54 girls and 49 boys were named Koi, so 52.4% were girls. Across 1880–2024, 43.1% of the 1,358 US babies named Koi were girls.
- Boy rank, 2024
- #2,685
- Girl rank, 2024
- #3,026
- Babies named Koi since 1995
- 1,358
- Most popular year
- 2023
- 127 babies
Boys and girls named Koi, by decade
Every year
| Year | Boys | Boy rank | Girls | Girl rank |
|---|---|---|---|---|
| 2024 | 49 | #2,685 | 54 | #3,026 |
| 2023 | 55 | #2,458 | 72 | #2,475 |
| 2022 | 64 | #2,259 | 43 | #3,623 |
| 2021 | 53 | #2,516 | 66 | #2,619 |
| 2020 | 47 | #2,678 | 34 | #4,123 |
| 2019 | 39 | #3,079 | 33 | #4,302 |
| 2018 | 34 | #3,337 | 32 | #4,407 |
| 2017 | 26 | #4,045 | 25 | #5,256 |
| 2016 | 27 | #3,935 | 19 | #6,556 |
| 2015 | 22 | #4,479 | 18 | #6,862 |
| 2014 | 34 | #3,273 | 22 | #5,897 |
| 2013 | 34 | #3,240 | 26 | #5,225 |
| 2012 | 25 | #4,080 | 15 | #8,037 |
| 2011 | 40 | #2,933 | 14 | #8,431 |
| 2010 | 34 | #3,277 | 20 | #6,523 |
| 2009 | 20 | #4,850 | 10 | #11,109 |
| 2008 | 25 | #4,095 | 13 | #9,269 |
| 2007 | 17 | #5,330 | 11 | #10,507 |
| 2006 | 19 | #4,788 | 15 | #8,066 |
| 2005 | 15 | #5,453 | 7 | #13,790 |
| 2004 | 14 | #5,655 | 6 | #15,180 |
| 2003 | 12 | #6,085 | 9 | #10,897 |
| 2002 | 14 | #5,281 | 9 | #10,692 |
| 2001 | 12 | #5,878 | 7 | #12,797 |
| 2000 | 9 | #7,148 | 0 | – |
| 1999 | 8 | #7,547 | 5 | #15,713 |
| 1998 | 0 | – | 0 | – |
| 1997 | 10 | #5,900 | 0 | – |
| 1996 | 8 | #6,848 | 0 | – |
| 1995 | 7 | #7,436 | 0 | – |
Highest rank
As a boy name, Koi reached #2,259 in 2022. As a girl name, it reached #2,475 in 2023. Ranks count every name SSA published for that year and sex, so they go well past the top 1,000.
Names from the same era
These names were also most popular in the 2020s, with a similar number of babies. They can work as sibling or middle names that feel like they belong together.
Names spelled like Koi
Source: US Social Security Administration baby name data, 1880–2024. Counts are Social Security card applications for US births; SSA leaves out names given to fewer than 5 babies in a year. Updated 2026-10-05. How these numbers are made.