UK boy's name
Sejun
A diminutive of Korean masculine names containing the hanja character "se" meaning truth or victory.
For 2026, the newest official UK baby-name figures on this page are from 2020. That release is the current official benchmark rather than a forecast.
Sejun is a boy's name in the UK records. People looking for Sejun popularity in 2026 should use the latest official release, which is 2020 in this profile. In that release it ranked #4608, with 3 babies registered with the name. Its strongest year in the published records was 2018, with 4 births.
This profile covers 7 England and Wales registrations across 2 recorded years from 2018 to 2020. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.
The latest count is about 75% of the recorded peak, which gives a quick read on how the name has moved since its high point.
We estimate that about 7 living people in the UK are called Sejun. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2021 or 2026.
Key insights
- • Sejun ranked #4608 for boys in England and Wales in 2020, with 3 registrations.
- • The name peaked in 2018, when 4 boys were registered as Sejun.
- • About 7 living people in the UK are estimated to have Sejun as a first name, after adjusting past birth registrations with ONS life tables.
Latest rank (E&W)
#4608
2020
Births in 2020
3
Latest year
Peak year
2018
4 births
Estimated living
7
2026
Meaning
What does Sejun mean?
Sejun is a Korean given name that has its origins in the ancient Korean language. The name can be traced back to the Silla Kingdom, which ruled over parts of the Korean peninsula from 57 BC to 935 AD.
The name Sejun is composed of two Korean words: "se", meaning "world" or "universe", and "jun", meaning "noble" or "gentle". Therefore, the name Sejun can be interpreted as "noble one of the universe" or "gentle world".
One of the earliest recorded instances of the name Sejun can be found in the Samguk Sagi, a historical record of the Three Kingdoms of Korea written in 1145 AD. The text mentions a noble scholar named Sejun Kim, who lived during the Silla Kingdom in the 8th century AD.
Throughout Korean history, several notable figures have borne the name Sejun. One such individual was Sejun Park (1629-1703), a renowned Confucian scholar and writer during the Joseon Dynasty. His works, which include commentaries on classical texts, had a significant influence on the intellectual landscape of his time.
Another historical figure named Sejun was Sejun Yi (1745-1821), a prominent calligrapher and artist during the late Joseon Dynasty. His calligraphic works are celebrated for their elegance and mastery of the brushstroke.
In the 19th century, Sejun Choi (1834-1901) was a respected statesman and diplomat who played a crucial role in Korea's relations with neighboring countries, particularly during the era of modernization and opening to the West.
A more recent historical figure with the name Sejun was Sejun Kim (1905-1984), a pioneering film director and screenwriter who is considered one of the founders of Korean cinema. His films, such as "Broken Strings" (1936) and "Hurrah! For Freedom" (1946), explored themes of social justice and national identity.
While the name Sejun has roots in ancient Korean history, it has continued to be used as a given name in modern times, reflecting the enduring cultural significance and appreciation for its meaning and heritage.
Sourced from namecensus.com.
Popularity
Sejun over time
The chart below shows babies named Sejun registered in England and Wales in the years where the name appears in the published records, from 2018 to 2020. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.
For Sejun, the clearest high point is 2018. The latest England and Wales figure is 3 births in 2020, compared with 4 at the peak.
Babies born per year
Decades
Sejun by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Sejun was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.
| Decade | Average rank | Total births | Years covered |
|---|---|---|---|
| 2020s | #4608 | 3 | 1 |
| 2010s | #3959 | 4 | 1 |
Related
Names similar to Sejun
- Samuel 108,505
- Sebastian 33,008
- Sam 20,889
- Stanley 16,354
- Sonny 15,028
- Sean 15,006
- Scott 12,587
- Seth 9,841
- Syed 9,050
- Stephen 8,884
- Spencer 8,333
- Steven 6,970
FAQ
Sejun: questions and answers
How popular is the name Sejun in the UK right now?
In 2020, Sejun was ranked #4608 for boys in England and Wales, with 3 births registered.
When was Sejun most popular?
The peak year on record was 2018, with 4 babies registered as Sejun in England and Wales.
What is the meaning and origin of Sejun?
A diminutive of Korean masculine names containing the hanja character "se" meaning truth or victory.
How many people are called Sejun in the UK?
A total of 7 babies have been registered as Sejun across the 2 years of ONS England & Wales records shown here.
Which records is this page based on?
The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.