UK girl's name
Casi
Spanish diminutive of Casilda meaning "chaste, pure".
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.
Casi is a girl's name in the UK records. People looking for Casi popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #2411, with 11 babies registered with the name. Its strongest year in the published records was 2017, with 15 births.
This profile covers 172 England and Wales registrations across 20 recorded years from 2002 to 2024. 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 73% of the recorded peak, which gives a quick read on how the name has moved since its high point.
We estimate that about 171 living people in the UK are called Casi. 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
- • Casi ranked #2411 for girls in England and Wales in 2024, with 11 registrations.
- • The name peaked in 2017, when 15 girls were registered as Casi.
- • About 171 living people in the UK are estimated to have Casi as a first name, after adjusting past birth registrations with ONS life tables.
Latest rank (E&W)
#2411
2024
Births in 2024
11
Latest year
Peak year
2017
15 births
Estimated living
171
2026
Meaning
What does Casi mean?
The name Casi has its origins in the ancient Roman culture, dating back to the early centuries of the Roman Empire. It is derived from the Latin word "castus," which means pure or chaste. The name was initially used as a virtue name, bestowed upon children to symbolize purity and moral integrity.
During the Roman era, the name Casi was relatively uncommon, but it gained prominence in the later years of the empire. One of the earliest recorded instances of the name can be found in the writings of the Roman historian Tacitus, who mentioned a nobleman named Cassius in his annals.
In the Middle Ages, the name Casi saw a resurgence in popularity among the Christian communities of Europe. It was often given to individuals who dedicated their lives to the Church or lived a life of piety and virtue. Several notable figures bore this name during this time, including Casi di Narni, an Italian monk and scholar who lived in the 12th century.
As the Renaissance period dawned, the name Casi continued to hold significance, particularly in Italy. One of the most famous bearers of this name was Casi Buonarroti, the nephew of the renowned artist Michelangelo Buonarroti. Casi Buonarroti was born in 1516 and served as a prominent figure in the Florentine Republic.
In the 17th century, the name Casi gained popularity in Spain, where it was sometimes spelled as "Casio." One notable figure from this era was Casio de Montealegre, a Spanish soldier and explorer who participated in the conquest of Chile in the late 1500s.
Moving forward to the 18th century, the name Casi found its way to the American colonies. One of the earliest recorded instances of the name in the United States was Casi Winslow, a prominent merchant and landowner from Massachusetts, born in 1712.
Throughout history, the name Casi has been associated with various individuals from diverse backgrounds, including scholars, artists, and military figures. While it may not be as common today as it once was, the name remains a testament to the enduring influence of ancient Roman culture and the virtues it sought to uphold.
Sourced from namecensus.com.
Popularity
Casi over time
The chart below shows babies named Casi registered in England and Wales in the years where the name appears in the published records, from 2002 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 Casi, the clearest high point is 2017. The latest England and Wales figure is 11 births in 2024, compared with 15 at the peak.
Babies born per year
Decades
Casi by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Casi 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 | #2504 | 52 | 5 |
| 2010s | #2768 | 97 | 10 |
| 2000s | #3742 | 23 | 5 |
Related
Names similar to Casi
- Chloe 111,265
- Charlotte 88,733
- Caitlin 28,931
- Courtney 23,162
- Chelsea 13,049
- Clara 9,435
- Connie 8,402
- Catherine 8,376
- Charlie 7,964
- Cerys 7,506
- Casey 7,018
- Cara 6,375
FAQ
Casi: questions and answers
How popular is the name Casi in the UK right now?
In 2024, Casi was ranked #2411 for girls in England and Wales, with 11 births registered.
When was Casi most popular?
The peak year on record was 2017, with 15 babies registered as Casi in England and Wales.
What is the meaning and origin of Casi?
Spanish diminutive of Casilda meaning "chaste, pure".
How many people are called Casi in the UK?
A total of 172 babies have been registered as Casi across the 20 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.