NameCensus.

UK boy's name

Caio

A masculine name of Latin origin meaning "rejoice" or "exult".

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.

Caio is a boy's name in the UK records. People looking for Caio popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #1076, with 27 babies registered with the name. Its strongest year in the published records was 2022, with 43 births.

This profile covers 554 England and Wales registrations across 28 recorded years from 1996 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 63% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 551 living people in the UK are called Caio. 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

  • Caio ranked #1076 for boys in England and Wales in 2024, with 27 registrations.
  • The name peaked in 2022, when 43 boys were registered as Caio.
  • About 551 living people in the UK are estimated to have Caio as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#1076

2024

Births in 2024

27

Latest year

Peak year

2022

43 births

Estimated living

551

2026

Meaning

What does Caio mean?

The given name Caio has its origins in ancient Roman culture, deriving from the Latin word "Gaius," which means "to rejoice" or "to be happy." It was a common praenomen, or personal name, among Roman citizens during the Republican and Imperial periods.

The earliest recorded instance of the name Caio can be traced back to the Roman Republic, with notable figures such as Gaius Julius Caesar, the famous military leader and statesman who played a crucial role in the transition from the Roman Republic to the Roman Empire. Caesar was born in 100 BC and assassinated on the Ides of March in 44 BC.

Another prominent historical figure bearing the name Caio was Gaius Suetonius Tranquillus, a Roman historian and biographer who lived in the early 2nd century AD. He is best known for his work "De Vita Caesarum," which provides invaluable insights into the lives of the first twelve Roman emperors.

In the realm of philosophy, Gaius Musonius Rufus, a Stoic philosopher who lived during the 1st century AD, was a notable bearer of the name. He was revered for his teachings on ethics and virtue, and his works influenced later Stoic thinkers.

Moving into the Christian era, one cannot overlook Gaius, also known as Caius, a 3rd-century Christian author and theologian. He is remembered for his writings against the Montanist heresy and his contributions to early Christian literature.

Another significant figure was Gaius Marius, a Roman general and statesman who lived in the 2nd century BC. He played a pivotal role in reforming the Roman army and was elected consul an unprecedented seven times, making him one of the most influential political figures of his time.

Throughout history, the name Caio has been used across various cultures and regions, often adapted to fit the local language and traditions. While its origins can be traced back to ancient Rome, the name has transcended its original context and has been embraced by many societies, each adding its unique cultural significance and historical relevance.

Sourced from namecensus.com.

Popularity

Caio over time

The chart below shows babies named Caio registered in England and Wales in the years where the name appears in the published records, 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 Caio, the clearest high point is 2022. The latest England and Wales figure is 27 births in 2024, compared with 43 at the peak.

Babies born per year

Caio
011223243199620102024

Decades

Caio by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Caio 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 #979 155 5
2010s #1034 275 10
2000s #1789 113 10
1990s #2621 11 3

Related

Names similar to Caio

FAQ

Caio: questions and answers

How popular is the name Caio in the UK right now?

In 2024, Caio was ranked #1076 for boys in England and Wales, with 27 births registered.

When was Caio most popular?

The peak year on record was 2022, with 43 babies registered as Caio in England and Wales.

What is the meaning and origin of Caio?

A masculine name of Latin origin meaning "rejoice" or "exult".

How many people are called Caio in the UK?

A total of 554 babies have been registered as Caio across the 28 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.