Koji
given name · Japanese · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
Koji is a given name, most frequently recorded in Japan, where it is the 35th most common given name. It appears chiefly in Japanese and English, written in the Latin script. Recorded meaning: Rōmaji transcription of こじ.
- JPJapan1 in 879◐
- USUnited States1 in 270K
- SGSingapore1 in 99K
carrying the name, one hue, darker where it is more common. Hover a country for its figure.
- ≈1.6K ●
- 2 ●
- Sources
- 177 ●
- 1 in 270K ◐
across 9 countries
recorded for this name
73K records
Official registry-verified
United States
Spellings & scripts●
Spellings marked ● are how people bearing the name write it in our records; ○ marks a model's transliteration. Click a spelling to open its page.
Meaning & origin●
Rōmaji transcription of こじ
Sources 1
- kaikki.org Wiktionary extract (IPA + transliterations)
Attested across 15 languages in the etymology graph.
Where in the world●
Sorted by bearers counted by national registers, records where none counts.
| Country | Most common spelling | Sources | |||||
|---|---|---|---|---|---|---|---|
| JP Japan | #35 | 82,168 | 66K rec. | — | listed | Koji | 176 |
| US United States | — | 1,232 | 5.8K rec. | 1 in 270K | 1.2K | Koji | 177 |
| CA Canada | — | 297 | 292 rec. | — | 1 | Koji | 36 |
| CN China | — | 257 | 20 rec. | — | — | Koji | 19 |
| BR Brazil | — | 245△ | 1 rec. | 1 in 864K | 245 | — | 1 |
| GB United Kingdom | — | 244 | 205 rec. | — | listed | Koji | 41 |
| NG Nigeria | — | 124 | 128 rec. | — | — | Koji | 10 |
| PH Philippines | — | 116 | 66 rec. | — | — | Koji | 22 |
| SG Singapore | — | 109 | 100 rec. | — | — | Koji | 30 |
| IN India | — | 72 | 46 rec. | — | 5 | Koji | 11 |
| RU Russia | — | 69 | 73 rec. | — | — | Koji | 12 |
| TW Taiwan | — | 50 | 16 rec. | — | — | Koji | 19 |
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table. How that works.
Languages●
- Japanese89K83%
- English6.4K6%
- Portuguese5.4K5%
- Spanish1.1K1%
- Hindi7221%
Show as table
| Name | Records | Note |
|---|---|---|
| Japanese | 88,783 | 83% |
| English | 6,415 | 6% |
| Portuguese | 5,408 | 5% |
| Spanish | 1,099 | 1% |
| Hindi | 722 | 1% |
Language is read off each record's context, not declared by the bearer; a share is of all records for this spelling.
Other recorded senses●
Koji is also recorded in 3 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
‘Filial ruler’; ‘happy second [son)’.
as a nameA concise dictionary of first names
In English, A substance that is produced by letting a mold, especially Aspergillus oryzae, grow on rice, barley, soybeans, etc., used to make fermented products such as sake, amazake, miso, and soy sauce.
as a wordkaikki.org Wiktionary extract (IPA + transliterations)
In Serbo-Croatian, which, what
as a wordkaikki.org Wiktionary extract (IPA + transliterations)
Ordered by how much of this spelling's record each language holds, so a sense from a language the name is barely used in sits last rather than first.
Over time●
Show as table
| Year | records |
|---|---|
| 1922 | 5 |
| 1925 | 5 |
| 1926 | 6 |
| 1972 | 9 |
| 1973 | 5 |
| 1974 | 7 |
| 1975 | 6 |
| 1980 | 5 |
| 1982 | 5 |
| 1983 | 12 |
| 1984 | 18 |
| 1985 | 6 |
| 1986 | 7 |
| 1988 | 6 |
| 1989 | 6 |
| 1990 | 10 |
| 1991 | 8 |
| 1992 | 14 |
| 1994 | 5 |
| 1995 | 13 |
| 1996 | 7 |
| 1998 | 9 |
| 1999 | 7 |
| 2000 | 14 |
| 2001 | 10 |
| 2002 | 13 |
| 2003 | 14 |
| 2004 | 13 |
| 2005 | 18 |
| 2006 | 11 |
| 2007 | 17 |
| 2008 | 21 |
| 2009 | 15 |
| 2010 | 21 |
| 2011 | 14 |
| 2012 | 14 |
| 2013 | 18 |
| 2014 | 15 |
| 2015 | 17 |
| 2016 | 28 |
| 2017 | 13 |
| 2018 | 14 |
| 2019 | 15 |
| 2020 | 12 |
| 2021 | 19 |
| 2022 | 26 |
| 2023 | 33 |
| 2024 | 25 |
| 2025 | 34 |
US SSA — National Baby Names (1880–present) — 49 years between 1922–2025. One register's own figures, never a sum across registers: two registers counting the same people would double them.
Notable people with this name●
- Kōji Yakushob. 1956JPJapanese actor (1956-)
- Kōji Morimotob. 1959JPJapanese anime director
- Koji Kondob. 1961JPJapanese composer and pianist (born 1961)
- Kōji Tsujitanib. 1962JPJapanese actor, voice actor, narrator and director of audiography
- Kōji Yamamurab. 1964JPJapanese independent animator
- Kōji Kikkawab. 1965JPJapanese singer-songwriter, actor
- Kōji Imadab. 1966JPJapanese actor
- Kōji Murofushib. 1974JPJapanese hammer thrower, university professor (physical education), commissioner of the Japan sports agency
- Kouji Wadab. 1974JPnot in their usual nameJapanese singer (1974-2016)
- Koji Setob. 1988JPJapanese actor singer
The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).
Evidence●
Attested in 36 sources across 20 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| US United States | Census Bureau — First Name Frequency 2020 by sex | 2020 | 1.2K | #10,668 |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 498 | #17,171 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2022 | 245 | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 242 | #21,979 |
| BR Brazil | Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA) | — | 237 | #10,394 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1960 | 220 | — |
| BR Brazil | IBGE — Nomes (census name API) | — | 184 | #26,504 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1950 | 150 | — |
| US United States | Census Bureau — Surname Frequency 2020 | 2020 | 134 | #131,805 |
| US United States | Census Bureau — Surname Frequency 2010 | 2010 | 109 | #150,452 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1940 | 89 | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | 1950 | 70 | — |
Reference works 3
- Dictionary of American Family Names
- Wikipedia given-name tokens
- Wikipedia surname tokens
These works list the name; their figures are licensed and are not reproduced here.
Register rows as of the 2026-09-12 data build · 125 rows in the corpus for this spelling.
Frequently asked questions
- How common is the name Koji?
- We estimate roughly 1.6 thousand people bear Koji (counting its spellings and scripts) across 9 countries in our records.
- In which country does Koji have the most bearers?
- Koji is most frequently recorded in Japan, where it is most often spelled koji.
- How common is Koji compared with other names?
- In Japan, Koji is the 35th most common given name of 355,102 given names recorded there.
- Is Koji a male or female name?
- Koji 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.
- What does the name Koji mean?
- Recorded meaning: Rōmaji transcription of こじ
Query this name via API
curl https://api.mondonomo.ai/api/v1/name-graph/kojiThe same payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. Rate-limited for casual use. Bulk access and licensing.
About this data
Data snapshot . Figures are rebuilt periodically and will change.
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, “Koji” — the 35th most common given name in Japan. Data snapshot 2026-09-12.