Koi
#3,060 in 2025UnisexBoys' nameGirls' nameMeaning not yet documented
Koi has been given to 1,482 babies in the U.S. since 1995. In 2025 it ranked #3,060 of 13,926 boys’ names in use. Its peak year was 2022, with 64 recorded. It's used for both sexes: 55% boys, 45% girls all-time.
Babies named Koi, 2025
1 in 82,900
Koi over time, 1880–2025
Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.
Girls or boys — Koi over time
In 2025, Koi went to 68% girls and 32% boys.
A sex is only published in years it reached five applications, so a stretch at 0% or 100% means the other side stayed under that floor — not that it was never used.
How common is Koi?
Everything below is computed from the 2025 data — the most recent year available.
- Among all babies, 2025
- 1 in 82,900
- 40 of 3,315,165 births
- Among boys only
- 1 in 42,700
- <0.01% of boys
- Rank, 2025
- #3,060
- of 13,926 boys’ names in use
- Coin-flip room size
- 57,449 kids
- Even odds of a second one
Where Koi sits on the popularity scale
Chance at least one other child shares the name
If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.
Put another way: gather 57,449 children born in 2025 and it's an even bet that one of them is another Koi. In a class of 30 the chance is Under 1%.
When Kois were born
Half of everyone ever recorded as Koi was born before 2017 — so the typical Koi is around 8 today.
- Biggest decade
- 2010s
- 38.7% of all use
- Born in the last 25 years
- 94.8%
- A modern name
- Recorded since 1950
- 813
- People you could plausibly meet
2010s — 38.7% of all recorded uses (315).
Is Koi rising or falling?
Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.
- Rank vs 1 year ago
- −367
- Places dropped
- Rank vs 5 years ago
- −383
- Places dropped
- Rank vs 10 years ago
- +1,418
- Places climbed
- Births vs 10 years ago
- 1.82×
- More babies than then
- Share of its own peak
- 62.5%
- Peak was 2022 (64)
- Years since peak
- 3
- Years
- Year-to-year steadiness
- Shifting
- 23.5% average annual change
Where Koi is used — boys
Across 1910–2025, Koi was most concentrated in Georgia — about 1 in 100,000 boys, against 1 in 518,347 across all states with data. It was least common in Texas (1 in —).
Most concentrated
- 1Georgia1 in 100,000
- 2Louisiana1 in 100,000
- 3California1 in —
- 4Florida1 in —
- 5Illinois1 in —
- 6North Carolina1 in —
- 7Pennsylvania1 in —
- 8Texas1 in —
Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Koi has too little recent state data to map, so this covers all years from 1910.
Where Koi is used — girls
Across 2016–2025, Koi was most concentrated in Louisiana — about 1 in 5,556 girls, against 1 in 33,405 across all states with data. It was least common in Pennsylvania (1 in 100,000).
Most concentrated
- 1Louisiana1 in 5,556
- 2Georgia1 in 14,286
- 3Florida1 in 25,000
- 4Texas1 in 50,000
- 5Virginia1 in 50,000
- 6North Carolina1 in 100,000
- 7New York1 in 100,000
- 8Pennsylvania1 in 100,000
Shading is the share of that state's recorded girls given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings.
Koi around the world
Where Koi ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.
- England & Wales2016–2016#4,810in 2016
- South Australia2009–2009#708in 2009
Popularity data from Office for National Statistics and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. CBS SA data under CC BY 4.0.
Koi by the numbers
The raw record for each sex the name is used for.
As a boy's name
Names similar to Koi
Matched on shared beginnings and endings, similar length, and comparable popularity.
Sibling names for Koi
Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.