How Many People Are Named Koi?
An estimated 1,347 people in the United States have the first name Koi. It is used for both genders, with 56.9% male. The average bearer is 11 years old, and Koi peaked in popularity in 2023 with 127 births that year.
Below you will find a full statistical profile of Koi as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Koi paired with any surname.
Key Insights
- Koi is a genuinely unisex name, given to both boys and girls in roughly equal numbers.
- Koi is a modern name. With an average bearer age of just 11, it has gained most of its popularity in recent years.
Estimated Living Americans
1,347
About 1 in 254,458 people in the U.S.
Rarity
Rare
Predicted Gender
Male
56.9% confidence
Average Age
11
years old
Peak Year
2023
127 births
Total Registered
1,358
since 1880
Gender Distribution for Koi
Koi is a genuinely unisex name, used for both males (56.9%) and females (43.1%). Out of 1,358 total births registered, 773 were male and 585 were female.
Koi as a male name
Ranked #2,685 in 2024
49 male births in 2024
Peak: 2022 (64 births)
Koi as a female name
Ranked #3,026 in 2024
54 female births in 2024
Peak: 2023 (72 births)
Koi: Popularity Over Time
SSA records for Koi span from the 1990s to the 2020s, covering 4 decades of naming data. The most popular decade for this name was the 2010s, when 539 babies were registered. Koi remains highly popular today, with recent registration numbers near its historical peak.
Koi by Decade
How has Koi tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Koi by State
Birth registrations for Koi span all 9 states and territories in the SSA database. The highest counts are in Louisiana, Texas, Georgia. The lowest are in North Carolina, Illinois, New York. On average, about 26 Kois were registered per state.
Koi + Last Name Combinations
How many people share a full name with Koi as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Koi
Other first names starting with K with a similar number of bearers.
Koi: Questions and Answers
How many people in the U.S. are named Koi?
We estimate approximately 1,347 people named Koi are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 254,458 Americans share this first name.
Is Koi a common name?
Koi is classified as "Rare" and is more popular than 91.8% of all first names in the SSA database. A total of 1,358 births have been registered with this name since 1880.
When was Koi most popular?
Koi reached peak popularity in 2023, when 127 babies were given this name. The average age of a living person named Koi is approximately 11 years old, reflecting when the name was most commonly given.
Is Koi a male name?
Koi is predominantly male. 56.9% of people with this name are male. See the gender breakdown above for full details.
How many Koi Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Koi Smith, Koi Johnson, Koi Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 0 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau estimate. Full methodology.
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