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Koi

Koi is a unisex given name: about 63% of people named Koi are men and 37% are women, so a gendered salutation is a coin flip and the neutral form is the safe choice.

UnisexMedium
Male 63%Female 37%

This name is used for both men and women without a strong lean either way.

Verdict
Unisex
Male / female split
63% male / 37% female
Confidence
Medium (8 to 63 weighted country observations)
Most common in
United States
US births since 1880
432 male / 250 female
Data
nam_dict (GFDL) + US SSA
Updated
2026-09-11

How to address Koi

To address Koi when you do not know their gender, use the full name with no title: "Dear Koi," in English, "Guten Tag Koi," in German. About 63% of people named Koi are men and 37% are women, so a gendered salutation is close to a coin flip, and the neutral form above is the safer choice.

Ready-made greetings in six languages

English

Dear Koi,

German

Guten Tag Koi,

French

Bonjour Koi,

Spanish

Estimado/a Koi:

Chinese

Koi您好：

Japanese

Koi様

English

Hi Koi,

German

Hi Koi,

French

Salut Koi,

Spanish

Hola Koi,

Chinese

Koi你好：

Japanese

Koiさん

Greeting generator

This is a statistical estimate, not a statement about the gender, identity or correct form of address of any particular person.

Country breakdown

Gender of the name Koi by country (nam_dict, 55 country columns)
CountryHow commonUsuallyMale share
United Statesuncommonunisex name63%

United States birth data

432 male · 250 female · 682 births recorded

Male 63%Female 37%

Since 1980: 63% male.

Frequently asked questions

Is Koi a male or female name?

Koi is a unisex given name: about 63% of people named Koi are men and 37% are women, so a gendered salutation is a coin flip and the neutral form is the safe choice.

How do I address Koi in an email?

To address Koi when you do not know their gender, use the full name with no title: "Dear Koi," in English, "Guten Tag Koi," in German. About 63% of people named Koi are men and 37% are women, so a gendered salutation is close to a coin flip, and the neutral form above is the safer choice.

Is Koi a unisex name?

Koi is a unisex name: 63% of people named Koi are men. The split stays close across most of the countries in the data.

Related names

MariaFemaleAnnaFemaleMarieFemalePeterMaleJeanDepends on the countryAlexanderMaleDavidMaleJoseMale

Sources

Gender by country: nam_dict, the c't first-names dictionary by Joerg Michael, roughly 44,000 names across 55 countries, licensed GFDL. US frequencies: United States Social Security Administration baby-name data, public domain. Method: how we classify names. Full dataset: data & licences. Data built 2026-09-11.

Cite this page

DearWho, "Is Koi a male or female name?", https://dearwho.vercel.app/name/koi (accessed 2026-09-11). Data: nam_dict (J. Michael, GFDL) and US SSA, built 2026-09-11.

BibTeX
@misc{dearwho_koi,
  title  = {Is Koi a male or female name?},
  author = {{DearWho}},
  year   = {2026},
  url    = {https://dearwho.vercel.app/name/koi},
  note   = {Data: nam_dict (GFDL), US SSA public domain}
}