UK name, mostly boys
Kai
Masculine name of Hawaiian origin meaning "the sea".
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.
Kai is mostly registered for boys in the UK records. People looking for Kai popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #72, with 735 babies registered with the name. Its strongest year in the published records was 2010, with 1,308 births.
This profile covers 24,432 England and Wales registrations across 29 recorded years from 1996 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 56% of the recorded peak, which gives a quick read on how the name has moved since its high point.
We estimate that about 28,278 living people in the UK are called Kai. 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
- • Kai ranked #72 for boys in England and Wales in 2024, with 735 registrations.
- • The name peaked in 2010, when 1,308 boys were registered as Kai.
- • Kai ranks best in Scotland in the latest published regional snapshot for that area, where it placed #56 in 2024.
- • About 28,278 living people in the UK are estimated to have Kai as a first name, after adjusting past birth registrations with ONS life tables.
- • Across the England and Wales records shown here, 99.1% of Kai registrations are for boys.
Latest rank (E&W)
#72
2024
Births in 2024
735
Latest year
Peak year
2010
1,308 births
Estimated living
28,278
2026
Gender
Boy and girl registrations for Kai
In England and Wales birth records, Kai has been registered for both boys and girls. Across the years shown here, 99.1% of registrations are for boys and 0.9% are for girls.
These figures use the sex categories in the published baby-name files. They are useful for spotting how the name is used at registration, but they are not a live measure of gender identity or everyone living with the name today.
Kai registered for boys
- Ranked #72 in 2024
- 735 boys registered in 2024
- Peak: 2010 (1,308 births)
Kai registered for girls
- Ranked #4,843 in 2024
- 4 girls registered in 2024
- Peak: 2004 (18 births)
Meaning
What does Kai mean?
The name Kai has its origins in a variety of languages and cultures across the world. It is believed to have derived from the Hawaiian word "kai," which means "sea" or "ocean." This connection to the natural world has given the name a sense of beauty and strength.
In Japanese, the name Kai can be written with the kanji characters 海 (meaning "ocean") or 開 (meaning "open" or "begin"). This suggests associations with new beginnings, expansiveness, and the vastness of the sea. The name has been popular in Japan for centuries and has been borne by notable figures such as Kai Shiden, a 16th-century samurai warrior.
The name Kai also has roots in Scandinavia, where it is derived from the Old Norse word "kær," meaning "beloved" or "affectionate." In this context, the name carries a sense of warmth and endearment. One of the earliest recorded instances of the name is in the Icelandic Sagas, where Kai Øvundsson was a prominent figure in the 13th century.
In Greek mythology, Kai was the name of one of the Titans, the primordial deities who ruled the cosmos before the Olympian gods. This association with ancient mythology and cosmic power has imbued the name with a sense of grandeur and timelessness.
Moving through history, we find notable individuals bearing the name Kai. In the 17th century, Kai Lykke was a renowned Danish naval admiral who played a pivotal role in the Kalmar War against Sweden. In the world of literature, Kai Hōffding was a Danish philosopher and psychologist who lived from 1853 to 1928 and made significant contributions to the field of ethics.
Another historical figure of note is Kai Hwang, a Chinese-American computer scientist born in 1936, who is widely recognized for his pioneering work in parallel processing and computer architecture. His contributions have had a lasting impact on the field of computer engineering.
These are just a few examples of the rich history and diverse cultural influences that have shaped the name Kai over the centuries. From its roots in Hawaiian and Japanese traditions to its Norse origins and connections to Greek mythology, the name has carried a tapestry of meanings and associations, making it a timeless and evocative choice.
Sourced from namecensus.com.
Popularity
Kai over time
The chart below compares boys and girls registered as Kai in England and Wales, from 1996 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 Kai, the clearest high point is 2010. The latest England and Wales figure is 735 births in 2024, compared with 1,308 at the peak.
Babies born per year
Decades
Kai by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Kai 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 | #82 | 3,445 | 5 |
| 2010s | #79 | 8,917 | 10 |
| 2000s | #64 | 10,349 | 10 |
| 1990s | #116 | 1,721 | 4 |
Geography
Where Kai is most common
The bars show the latest published local birth counts for Kai. 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.
Kai ranks best in Scotland in the latest published regional snapshot for that area, where it placed #56 in 2024.
Across the UK
Kai in Scotland and Northern Ireland
Scotland (NRS)
#56 in 2024
40 years of NRS records, 3,273 total registered
Northern Ireland (NISRA)
#69 in 2024
27 years of NISRA records, 780 total registered
Related
Names similar to Kai
- Kieran 30,429
- Kyle 28,463
- 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
- Kristian 2,788
FAQ
Kai: questions and answers
How popular is the name Kai in the UK right now?
In 2024, Kai was ranked #72 for boys in England and Wales, with 735 births registered.
When was Kai most popular?
The peak year on record was 2010, with 1,308 babies registered as Kai in England and Wales.
What is the meaning and origin of Kai?
Masculine name of Hawaiian origin meaning "the sea".
How many people are called Kai in the UK?
A total of 24,432 babies have been registered as Kai across the 29 years of ONS England & Wales records shown here, plus 3,273 more in Scotland and 780 in Northern Ireland.
Where is Kai most common?
In the latest published local rankings, Kai ranks best in Scotland, where it placed #56 in 2024. 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.