Baby Names US
boys' name ★ peaked 2025

Koji

Meaning Borrowed from Japanese こうじ (Kōji) Gender Boy Rank 2025 #3,412 Trend ↑ Rising 135%

Borrowed from Japanese こうじ (Kōji).

Rank 2025
#3,412
among boys · ↑862 vs 2024
Babies in 2025
34
named Koji · +36% vs 2024
How common
1 in 50,238
boys born in 2025
Peak year
2025
34 babies
All-time total
645
#6,778 all-time among boys
First recorded
1922
in Social Security records

Koji popularity over time

645 babies have been named Koji since 1922, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
0.010.010.020.0318801900192019401960198020002020Peak 2025Boys

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Boys Per year Change Best rank
1880s – – – –
1890s – – – –
1900s – – – –
1910s – – – –
1920s 16 2 – #3,978
1930s – – – –
1940s – – – –
1950s – – – –
1960s – – – –
1970s 27 3 – #3,495
1980s 65 7 +141% #2,656
1990s 73 7 +12% #4,233
2000s 146 15 +100% #4,639
2010s 169 17 +16% #3,844
2020s (to 2025) 149 25 +47% #3,412

Where Koji is heading

A five-year projection from the recent trend in births per 1,000 boys (damped so it flattens over time), converted to babies at today's birth totals. The implied rank places that projection in the 2025 field. A projection, not a promise: real trends bend.

Year Projected babies Per 1,000 boys Implied rank
2026 39 0.02 outside top 500
2027 43 0.03 outside top 500
2028 47 0.03 outside top 500
2029 51 0.03 outside top 500
2030 55 0.03 outside top 500

The story of Koji

Koji is rare for boys in the United States, ranked #3,412 in 2025 with 34 babies given the name. It is currently rising compared with a decade ago.

Since 1922, 645 American babies have been named Koji. Its peak came in 2025, when 34 newborns received the name, the signature sound of the 2020s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Koji stood among all boys' names in any year, or use the compare tool to plot it against other names.

How old are people named Koji?

The median living Koji is about 15 years old; half are between 6 and 26. An estimated 600 people named Koji are alive in the United States today.

median 15 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Koji year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Boys Boys rank
2025 34 #3,412
2024 25 #4,274
2023 33 #3,516
2022 26 #4,147
2021 19 #5,034
2020 12 #6,850
2019 15 #5,980
2018 14 #6,190
2017 13 #6,519
2016 28 #3,844
2015 17 #5,416
2014 15 #5,884
2013 18 #5,085
2012 14 #6,183
2011 14 #6,119
2010 21 #4,614
2009 15 #5,969
2008 21 #4,639
2007 17 #5,333
2006 11 #7,218
2005 18 #4,745
2004 13 #6,000
2003 14 #5,426
2002 13 #5,584
2001 10 #6,736
2000 14 #5,200
1995 13 #4,673
1990 10 #5,211
1985 6 #6,194
1980 5 #6,800
1975 6 #5,149
1970 – –
1965 – –
1960 – –
1955 – –
1950 – –
1945 – –
1940 – –
1935 – –
1930 – –
1925 5 #4,593
1920 – –
1915 – –
1910 – –
1905 – –
1900 – –
1895 – –
1890 – –
1885 – –
1880 – –

Famous people named Koji

The most globally famous bearers of the name, ranked by fame across Wikipedia editions (Pantheon project, MIT).

  1. 1 Koji Kondo Koji Kondo Japanese musician (born 1961) Contemporary
  2. 2 Koji Suzuki Koji Suzuki Japanese writer (1957–2026) Contemporary
  3. 3 Koji Igarashi Koji Igarashi Japanese video game designer b. 1968 · Contemporary
  4. 4 Koji Uehara Koji Uehara Japanese baseball player (born 1975) Contemporary
  5. 5 Koji Murofushi Koji Murofushi Former Japanese hammer thrower b. 1974 · Contemporary
  6. 6 Koji Gyotoku Japanese football player and manager b. 1965 · Contemporary
  7. 7 Koji Miyoshi Koji Miyoshi Japanese footballer (born 1997) Contemporary
  8. 8 Koji Maeda Japanese footballer and manager b. 1969 · Contemporary
  9. 9 Koji Yamase Japanese footballer b. 1981 · Contemporary
  10. 10 Koji Tanaka Japanese football player and manager (1955–2026) Contemporary
  11. 11 Koji Kondo Japanese association football player (1972–2003) Contemporary
  12. 12 Koji Kataoka Soccer player, Japan b. 1977 · Contemporary
  13. 13 Koji Homma Japanese footballer b. 1977 · Contemporary
  14. 14 Koji Hashimoto Soccer player, Japan b. 1986 · Contemporary
  15. 15 Koji Nakajima Japanese footballer b. 1977 · Contemporary
  16. 16 Koji Sakamoto Soccer player, Japan b. 1978 · Contemporary
  17. 17 Koji Sasaki Japanese footballer b. 1936 · Contemporary
  18. 18 Koji Noguchi Japanese footballer b. 1970 · Contemporary
  19. 19 Koji Kumagai Japanese footballer b. 1975 · Contemporary
  20. 20 Koji Funamoto Japanese footballer b. 1942 · Contemporary

Portraits from Wikipedia (Wikimedia Commons).

Frequently asked questions

Quick answers about Koji, drawn from the same Social Security data as the charts above.

How old is the average Koji?

The median living Koji is about 15 years old. Half of all living Kojis are between 6 and 26 years old.

How many people named Koji are alive today?

An estimated 600 people named Koji are alive in the United States, based on 645 recorded births and Social Security life tables.

What does the name Koji mean?

Borrowed from Japanese こうじ (Kōji).

How popular is the name Koji in 2025?

Koji ranked #3,412 among boys' names in the United States in 2025, with 34 babies given the name, according to Social Security Administration data.

How many people are named Koji?

645 babies have been named Koji in the United States since 1922, based on Social Security card applications.

When was the name Koji most popular?

Koji peaked in 2025, when 34 newborns received the name.

Is Koji a boy or girl name?

Koji is overwhelmingly a boy's name: 100% of babies with the name.

Is the name Koji rising or falling?

Koji is on the rise, noticeably more popular now than a decade ago.

Will Koji become more popular?

Koji is trending upward. If the recent trend holds, we project roughly 55 boys named Koji in 2030, which would rank outside the top 500. Forecasts assume the current trend continues and become less certain further out.

Who are famous people named Koji?

Well-known people named Koji include Koji Kondo (composer), Koji Suzuki (writer), Koji Igarashi (game designer).

Names like Koji

Names that sound and feel close to Koji: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Koji with similar names → More names starting with K →