Koi
Boy name · #3063 in 2025 · Uniqueness 81/100
Koi is currently the #3063 boy name in the United States — 40 babies received it in 2025. A decade ago it stood at #4407, so the name has been rising over the past ten years. Roughly one in every 45,000 boys born in 2025 was named Koi.
The 30-year story
Koi first appears in the Social Security records in 1995, when 7 boys received the name. Its all-time peak is essentially right now: 2022, with 64 babies and a rank of #2243. 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.
Babies named Koi per year, 1880–2025. Source: SSA.
Unlock the 5-year forecast and compare Koi against up to 5 other names.
Uniqueness: will there be another Koi in class?
Koi scores 81 out of 100 on our uniqueness scale, which blends current rarity with five-year momentum — putting it in the "rare" band. A high score means genuine rarity — your Koi will likely be the only one in the room, with the occasional spelling-out as the price.
Where Koi is most common
State-level data for Koi is sparse in 2025 — the name's footprint is too small for most states to report (the SSA suppresses counts under 5 per state for privacy).
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 Khoi, Roi, Kazi, Kanai, and Kairi.
KhoiRoiKaziKanaiKairiKaviKojiKahmari
Rank history (last 25 years)
| Year | Babies named Koi | Rank |
|---|---|---|
| 2025 | 40 | #3036 |
| 2024 | 49 | #2674 |
| 2023 | 55 | #2441 |
| 2022 | 64 | #2243 |
| 2021 | 53 | #2499 |
| 2020 | 47 | #2658 |
| 2019 | 39 | #3052 |
| 2018 | 34 | #3301 |
| 2017 | 26 | #3993 |
| 2016 | 27 | #3883 |
| 2015 | 22 | #4407 |
| 2014 | 34 | #3234 |
| 2013 | 34 | #3189 |
| 2012 | 25 | #4003 |
| 2011 | 40 | #2904 |
| 2010 | 34 | #3239 |
| 2009 | 20 | #4748 |
| 2008 | 25 | #4044 |
| 2007 | 17 | #5210 |
| 2006 | 19 | #4675 |
| 2005 | 15 | #5278 |
| 2004 | 14 | #5492 |
| 2003 | 12 | #5877 |
| 2002 | 14 | #5131 |
| 2001 | 12 | #5667 |
Frequently asked questions
Is Koi a popular boy name?
Koi ranked #3063 among boys in 2025 with 40 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #4407.
When was the name Koi most popular?
Koi peaked in 2022, when 64 American boys received the name (ranked #2243 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 45,000 newborn American boys was named Koi. It scores 81/100 on our uniqueness scale (rarity blended with momentum), which we classify as "rare".
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.