Koi
Girl name · #2207 in 2025 · Uniqueness 40/100
Koi is currently the #2207 girl name in the United States — 84 babies received it in 2025. A decade ago it stood at #6721, so the name has been rising over the past ten years. Roughly one in every 21,429 girls born in 2025 was named Koi.
Babies named Koi per year, 1880–2025. Source: SSA.
The 26-year story
Koi first appears in the Social Security records in 1999, when 5 girls received the name. Its all-time peak is essentially right now: 2025, with 84 babies and a rank of #2194. Names at their peak can keep climbing — or be one trend cycle from the long slide that eventually hits most popular names. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Unlock the 5-year forecast and compare Koi against up to 5 other names.
Uniqueness: will there be another Koi in class?
Koi scores 40 out of 100 on our uniqueness scale, which blends current rarity with five-year momentum — putting it in the "distinctive" band. That middle band is the sweet spot many parents hunt for: recognizable without being everywhere.
Where Koi is most common
Geography matters for names, and Koi is no exception. In 2025 the states with the most Kois were FL (13), TX (13), GA (10), VA (8), NC (5). Raw counts naturally favor populous states, but the spread still hints at where the name is part of the local naming culture.
Names like Koi
Statistically, parents drawn to Koi tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Kiari, Klani, Kylani, Koda, and Kamani.
KiariKlaniKylaniKodaKamaniKaoriKeariLumi
Rank history (last 25 years)
| Year | Babies named Koi | Rank |
|---|---|---|
| 2025 | 84 | #2194 |
| 2024 | 54 | #3013 |
| 2023 | 72 | #2466 |
| 2022 | 43 | #3595 |
| 2021 | 66 | #2608 |
| 2020 | 34 | #4078 |
| 2019 | 33 | #4260 |
| 2018 | 32 | #4357 |
| 2017 | 25 | #5191 |
| 2016 | 19 | #6401 |
| 2015 | 18 | #6721 |
| 2014 | 22 | #5797 |
| 2013 | 26 | #5143 |
| 2012 | 15 | #7804 |
| 2011 | 14 | #8196 |
| 2010 | 20 | #6382 |
| 2009 | 10 | #10679 |
| 2008 | 13 | #8965 |
| 2007 | 11 | #10129 |
| 2006 | 15 | #7868 |
| 2005 | 7 | #13010 |
| 2004 | 6 | #14179 |
| 2003 | 9 | #10425 |
| 2002 | 9 | #10246 |
| 2001 | 7 | #12056 |
Frequently asked questions
Is Koi a popular girl name?
Koi ranked #2207 among girls in 2025 with 84 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #6721.
When was the name Koi most popular?
Koi peaked in 2025, when 84 American girls received the name (ranked #2194 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Koi?
In 2025, roughly 1 in 21,429 newborn American girls was named Koi. It scores 40/100 on our uniqueness scale (rarity blended with momentum), which we classify as "distinctive".
Data source: U.S. Social Security Administration name statistics, 1880–2025, national and state files. Counts reflect Social Security card applications; names with fewer than 5 occurrences in a state-year are suppressed by the SSA.