UK boy's name
Kajus
A Lithuanian masculine given name derived from the name Cornelius.
For 2026, the newest official UK baby-name figures on this page are from 2024. That release is the current official benchmark rather than a forecast.
Kajus is a boy's name in the UK records. People looking for Kajus popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #2088, with 11 babies registered with the name. Its strongest year in the published records was 2013, with 56 births.
This profile covers 720 England and Wales registrations across 21 recorded years from 2004 to 2024. The figures come from ONS England and Wales, NRS Scotland and NISRA Northern Ireland, 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 20% of the recorded peak, which gives a quick read on how the name has moved since its high point.
We estimate that about 796 living people in the UK are called Kajus. 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 2025 or 2026.
Key insights
- • Kajus ranked #2088 for boys in England and Wales in 2024, with 11 registrations.
- • The name peaked in 2013, when 56 boys were registered as Kajus.
- • Kajus ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #334 in 2020.
- • About 796 living people in the UK are estimated to have Kajus as a first name, after adjusting past birth registrations with ONS life tables.
Latest rank (E&W)
#2088
2024
Births in 2024
11
Latest year
Peak year
2013
56 births
Estimated living
796
2026
Meaning
What does Kajus mean?
The name Kajus has its origins in ancient Rome, where it was derived from the Latin cognomen Gaius, which means "rejoice" or "celebrate." The name became popular during the Roman Republic and Empire, particularly among the patrician class.
One of the earliest recorded instances of the name can be found in the works of the Roman historian Livy, who mentions a Gaius Fabius Pictor, a Roman historian and painter who lived in the 3rd century BC. Another notable figure from this period was Gaius Julius Caesar, the famous Roman military leader and statesman who lived from 100 BC to 44 BC.
During the Middle Ages, the name Kajus evolved into various forms across different languages and cultures. In German, it became Kajus or Kaius, while in Scandinavia, it took the form of Kaise or Kaje.
One of the most famous individuals with the name Kajus was Kajus Munk, a Danish theologian and priest who lived from 1598 to 1628. He played a significant role in the Danish Reformation and is remembered for his religious writings and sermons.
In the 18th century, the name Kajus gained prominence in Poland, where it was sometimes spelled as Kajusz or Kajetan. One notable figure from this period was Kajetan Sosnowski, a Polish noble and military leader who fought against the Russian Empire in the late 18th century.
In the 19th century, the name Kajus experienced a resurgence in Germany, particularly among intellectuals and artists. One prominent figure with this name was Kajus Müller, a German painter and sculptor who lived from 1841 to 1912 and was known for his depictions of mythological scenes.
Another notable individual with the name Kajus was Kajus Dekaron, a Lithuanian writer and poet who lived from 1892 to 1947. He was a prominent figure in the Lithuanian literary scene and is remembered for his poetic works that explored themes of nature and national identity.
Throughout history, the name Kajus has been borne by individuals from various walks of life, including rulers, philosophers, artists, and religious figures. While its popularity has fluctuated over time, the name continues to be used in certain regions and cultures, carrying with it a rich historical legacy.
Sourced from namecensus.com.
Popularity
Kajus over time
The chart below shows babies named Kajus registered in England and Wales in the years where the name appears in the published records, from 2004 to 2024. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.
For Kajus, the clearest high point is 2013. The latest England and Wales figure is 11 births in 2024, compared with 56 at the peak.
Babies born per year
Decades
Kajus by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Kajus 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 | #1266 | 120 | 5 |
| 2010s | #705 | 477 | 10 |
| 2000s | #1353 | 123 | 6 |
Geography
Where Kajus is most common
The bars show the latest published local birth counts for Kajus. They are useful for spotting where the name is showing up in real numbers, while the rank beside each bar shows how strongly it performs inside that region.
Kajus ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #334 in 2020.
Across the UK
Kajus in Scotland and Northern Ireland
Scotland (NRS)
#701 in 2019
5 years of NRS records, 23 total registered
Northern Ireland (NISRA)
#334 in 2020
12 years of NISRA records, 58 total registered
Related
Names similar to Kajus
- Kieran 30,429
- Kyle 28,463
- Kai 24,432
- Kian 17,666
- Kayden 8,305
- Kevin 7,927
- Kane 7,149
- Kaiden 5,762
- Kieron 4,547
- Kacper 4,366
- Kye 4,012
- Kit 3,529
FAQ
Kajus: questions and answers
How popular is the name Kajus in the UK right now?
In 2024, Kajus was ranked #2088 for boys in England and Wales, with 11 births registered.
When was Kajus most popular?
The peak year on record was 2013, with 56 babies registered as Kajus in England and Wales.
What is the meaning and origin of Kajus?
A Lithuanian masculine given name derived from the name Cornelius.
How many people are called Kajus in the UK?
A total of 720 babies have been registered as Kajus across the 21 years of ONS England & Wales records shown here, plus 23 more in Scotland and 58 in Northern Ireland.
Where is Kajus most common?
In the latest published local rankings, Kajus ranks best in Northern Ireland, where it placed #334 in 2020. The regional bars on this page use birth counts, so they also reflect the size of each region.
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.