NameCensus.

UK boy's name

Caius

A masculine name of Latin origin, possibly from an old Roman family name.

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.

Caius is a boy's name in the UK records. People looking for Caius popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #1132, with 25 babies registered with the name. Its strongest year in the published records was 2023, with 35 births.

This profile covers 465 England and Wales registrations across 29 recorded years from 1996 to 2024. The figures come from ONS England and Wales and NRS Scotland, 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 71% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 471 living people in the UK are called Caius. 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

  • Caius ranked #1132 for boys in England and Wales in 2024, with 25 registrations.
  • The name peaked in 2023, when 35 boys were registered as Caius.
  • Caius ranks best in Scotland in the latest published regional snapshot for that area, where it placed #711 in 2020.
  • About 471 living people in the UK are estimated to have Caius as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#1132

2024

Births in 2024

25

Latest year

Peak year

2023

35 births

Estimated living

471

2026

Meaning

What does Caius mean?

The name Caius has its origins in ancient Rome, derived from the Latin word "gaudere," which means "to rejoice" or "to be glad." It was a popular name among the Roman patrician families and was often associated with nobility and distinction.

One of the earliest recorded instances of the name Caius can be found in the writings of the Roman historian Suetonius, who lived in the 1st and 2nd centuries AD. He mentions a Caius Julius Caesar, who was a member of the prestigious Julii family and a distant relative of the famous Roman dictator Julius Caesar.

In the 2nd century AD, the name Caius was borne by Gaius, a Roman jurist and legal scholar whose works formed a significant part of the Corpus Juris Civilis, the foundational texts of Roman law. His full name was Gaius, but he was often referred to as Caius by his contemporaries.

During the early Christian era, the name Caius gained some prominence as it was the name of one of the first popes of the Catholic Church. Pope Caius, also known as Gaius, was the Bishop of Rome from around 283 to 296 AD and is venerated as a saint in the Catholic tradition.

In the Middle Ages, the name Caius was used by several notable figures, including Caius Crispus, a philosopher and theologian from the 5th century, and Caius Sollius Apollinaris Sidonius, a Roman poet and diplomat from the 5th century.

One of the most famous bearers of the name Caius was Caius Plinius Secundus, better known as Pliny the Elder, a Roman author, naturalist, and natural philosopher who lived in the 1st century AD. His monumental work, Naturalis Historia (Natural History), was an encyclopedia covering a wide range of subjects, including the natural world, geography, and history.

Other notable historical figures with the name Caius include Caius Sallustius Crispus, a Roman historian from the 1st century BC, Caius Marius, a Roman general and statesman who lived in the 2nd century BC, and Caius Sempronius Gracchus, a Roman politician and reformer from the 2nd century BC.

Overall, the name Caius has a rich historical significance, rooted in ancient Roman culture and associated with nobility, scholarship, and achievement throughout various periods of history.

Sourced from namecensus.com.

Popularity

Caius over time

The chart below shows babies named Caius 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 Caius, the clearest high point is 2023. The latest England and Wales figure is 25 births in 2024, compared with 35 at the peak.

Babies born per year

Caius
09182635199620102024

Decades

Caius by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Caius 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 #1158 126 5
2010s #1396 189 10
2000s #1586 115 10
1990s #1494 35 4

Geography

Where Caius is most common

The bars show the latest published local birth counts for Caius. 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.

Caius ranks best in Scotland in the latest published regional snapshot for that area, where it placed #711 in 2020.

Scotland
3

Across the UK

Caius in Scotland and Northern Ireland

Scotland (NRS)

#711 in 2020

2 years of NRS records, 9 total registered

Related

Names similar to Caius

FAQ

Caius: questions and answers

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

In 2024, Caius was ranked #1132 for boys in England and Wales, with 25 births registered.

When was Caius most popular?

The peak year on record was 2023, with 35 babies registered as Caius in England and Wales.

What is the meaning and origin of Caius?

A masculine name of Latin origin, possibly from an old Roman family name.

How many people are called Caius in the UK?

A total of 465 babies have been registered as Caius across the 29 years of ONS England & Wales records shown here, plus 9 more in Scotland.

Where is Caius most common?

In the latest published local rankings, Caius ranks best in Scotland, where it placed #711 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.