Koïchi
given name · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
Koïchi is a male given name written in the Latin script, with more bearers in the United States than in any other country: 516 people, counted by the Census Bureau in 2020. Recorded meaning: Borrowed from Japanese こういち (Kōichi), a male given name with many variant kanji spellings.
- USUnited States1 in 645K(measured from records)
- SESweden1 in 2M
- PLPoland1 in 2.1M
carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). Countries with no figure are shown too: flat where a national register lists the name without counting it, hatched where only our records hold it. One hue, darker where it is more common; hover a country for its figure.
- United States (measured from records)
- Record sources
- 54 (measured from records)
- 1 in 645K (inferred from the name graph)
516 people, 2020
corpus datasets behind its best-documented spelling
strongest: highest-authority source
United States
measured from records inferred from the name graph
Spellings & scripts
(measured from records)One other spelling is counted as the same name:
Locally spelled Koichi in US United States, JP Japan.
Spellings marked ● are how people bearing the name write it in our records, and ○ marks a model's transliteration; click a spelling to open its page.
Meaning & origin
(measured from records)Borrowed from Japanese こういち (Kōichi), a male given name with many variant kanji spellings.
Cited for this meaning 2
- A concise dictionary of first names
- Wiktionary
Attested across 15 languages in the etymology graph.
Where in the world
(measured from records)Koïchi counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.
Sorted by bearers: national registers' counts, and Mondonomo's estimates (≈, est.) where no register counts.
| Country | Most common spelling | Sources | |||
|---|---|---|---|---|---|
| US United States | 516 | 1 in 645K | 513 | Koichi | 8 |
| BR Brazil | 75 | 1 in 2.8M | 106 | — | — |
| PL Poland | 18 | 1 in 2.1M | 18 | — | — |
| SE Sweden | 5 | 1 in 2M | 5 | — | — |
| JP Japan | ≈4 est. | ≈1 in 32M | listed | Koichi | 2 |
| CR Costa Rica | 1 | 1 in 5.1M | 1 | — | — |
516 people counted by Census Bureau — First Name Frequency 2020 by sex, 2020. Exact figures are national registers' own counts, while figures marked ≈ and est. are Mondonomo’s estimates, counted from our sources and calibrated against those registers; hover one for how far to trust it in that country. A dash means neither exists.
Registers cited: Census Bureau — First Name Frequency 2020 by sex; IBGE — names by decade (Kaggle mirror); Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA); dane.gov.pl — PESEL given names (first + second name position, 2026-01-20); dane.gov.pl — PESEL living persons (names); Skatteverket — Sök hur många som har ett visst namn (living population); TSE — electoral roll (padrón) names. Figures without a register are Mondonomo estimates; see Methodology.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table (how that works).
Evidence
(measured from records)No register attests this spelling yet
Frequently asked questions
- What does the name Koïchi mean, and where does it come from?
- Borrowed from Japanese こういち (Kōichi), a male given name with many variant kanji spellings. Recorded by A concise dictionary of first names and Wiktionary.
- Is Koïchi a male or female name?
- Koïchi is a male name in our records. Opposite-gender entries fall within the cross-gender noise we measure in the source data, so we don't report them as usage.
- Which countries have the most people named Koïchi?
- In the United States, the national register counted about 516 people named Koïchi, more than in any other country we hold, where it is most often spelled koichi. After it come Brazil, Poland, Sweden and Japan; the country table on this page ranks them.
- Where is Koïchi most common?
- Koïchi is densest in the United States, where the national register counts about 1 in 645 thousand people carrying it.
- How common is the name Koïchi?
- In the United States, the national register counted 516 people named Koïchi in 2020, about 1 in 645 thousand residents.
What do you want to know about Koïchi?
Nobody replies to these one by one, but what readers ask decides what these pages answer next.
Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/ko%C3%AFchiThe payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. It takes a free API key (1,000 requests a day), which returns what this page shows everyone; the full country table, every register citation and the year-by-year series come with a licensed key, as does bulk access.
About this data
measured from records inferred from the name graph machine-generated
These figures come from the data snapshot of and will change as it is rebuilt.
Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.
Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.
Cite this page Mondonomo, “Koïchi” — ranked 20132nd in the United States (Census Bureau, 2020). Data snapshot 2026-10-13.