Baby Names US
boys' name ★ peaked 2007

Seiji

Meaning Borrowed from Japanese せいじ (Seiji) Gender Boy Rank 2025 #9,569

Borrowed from Japanese せいじ (Seiji).

Rank 2025
#9,569
among boys · ↑153 vs 2024
Babies in 2025
8
named Seiji
How common
1 in 213,510
boys born in 2025
Peak year
2007
19 babies
All-time total
517
#7,747 all-time among boys
First recorded
1914
in Social Security records

Seiji popularity over time

517 babies have been named Seiji since 1914, 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
00.010.010.0218801900192019401960198020002020Peak 1925Boys

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 16 2 – #3,212
1920s 74 7 +363% #2,565
1930s 22 2 -70% #3,475
1940s – – – –
1950s – – – –
1960s – – – –
1970s 28 3 – #4,782
1980s 31 3 +11% #4,528
1990s 75 8 +142% #4,739
2000s 116 12 +55% #4,951
2010s 106 11 -9% #5,636
2020s (to 2025) 49 8 -23% #7,953

The story of Seiji

Seiji is rare for boys in the United States, ranked #9,569 in 2025 with 8 babies given the name. It is currently declining compared with a decade ago.

Since 1914, 517 American babies have been named Seiji. Its peak came in 2007, when 19 newborns received the name, the signature sound of the 2000s.

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 Seiji stood among all boys' names in any year, or use the compare tool to plot it against other names.

How old are people named Seiji?

The median living Seiji is about 19 years old; half are between 11 and 29. An estimated 400 people named Seiji are alive in the United States today.

median 19 020406080100

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

Seiji year by year

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

Year Boys Boys rank
2025 8 #9,569
2024 8 #9,722
2023 9 #8,809
2022 7 #10,665
2021 7 #10,599
2020 10 #7,953
2019 5 #13,805
2018 6 #11,898
2017 12 #7,029
2016 7 #10,550
2015 11 #7,437
2014 12 #6,986
2013 10 #7,999
2012 15 #5,942
2011 16 #5,636
2010 12 #7,024
2009 7 #10,780
2008 13 #6,701
2007 19 #4,951
2006 14 #6,041
2005 13 #6,159
2004 10 #7,432
2003 11 #6,647
2002 12 #6,009
2001 10 #6,855
2000 7 #8,973
1995 13 #4,739
1990 5 #9,274
1985 8 #5,070
1980 – –
1975 – –
1970 5 #5,321
1965 – –
1960 – –
1955 – –
1950 – –
1945 – –
1940 – –
1935 – –
1930 – –
1925 12 #2,565
1920 6 #4,207
1915 – –
1910 – –
1905 – –
1900 – –
1895 – –
1890 – –
1885 – –
1880 – –

Famous people named Seiji

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

  1. 1 Seiji Ozawa Seiji Ozawa Japanese conductor (1935–2024) Contemporary
  2. 2 Seiji Maehara Seiji Maehara Japanese politician (born 1962) Contemporary
  3. 3 Seiji Kimura Japanese footballer (born 2001) Contemporary
  4. 4 Seiji Kaneko Japanese footballer b. 1980 · Contemporary
  5. 5 Seiji Ueda Japanese astronomer b. 1952 · Contemporary
  6. 6 Seiji Honda Japanese footballer b. 1976 · Contemporary
  7. 7 Seiji Shindo Japanese footballer (born 1992) Contemporary
  8. 8 Seiji Koga Japanese footballer b. 1979 · Contemporary
  9. 9 Seiji Kawakami Japanese footballer b. 1995 · Contemporary
  10. 10 Seiji Kubo Soccer player, Japan b. 1973 · Contemporary

Portraits from Wikipedia (Wikimedia Commons).

Frequently asked questions

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

How old is the average Seiji?

The median living Seiji is about 19 years old. Half of all living Seijis are between 11 and 29 years old.

How many people named Seiji are alive today?

An estimated 400 people named Seiji are alive in the United States, based on 517 recorded births and Social Security life tables.

What does the name Seiji mean?

Borrowed from Japanese せいじ (Seiji).

How popular is the name Seiji in 2025?

Seiji ranked #9,569 among boys' names in the United States in 2025, with 8 babies given the name, according to Social Security Administration data.

How many people are named Seiji?

517 babies have been named Seiji in the United States since 1914, based on Social Security card applications.

When was the name Seiji most popular?

Seiji peaked in 2007, when 19 newborns received the name.

Is Seiji a boy or girl name?

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

Is the name Seiji rising or falling?

Seiji is declining, less popular now than a decade ago.

Who are famous people named Seiji?

Well-known people named Seiji include Seiji Ozawa (conductor), Seiji Maehara (politician), Seiji Kimura (soccer player).

Names like Seiji

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

Compare Seiji with similar names → More names starting with S →