NameCensus.

UK boy's name

Cassius

A masculine Roman name derived from Latin meaning "hollow", "empty", or "vain".

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.

Cassius is a boy's name in the UK records. People looking for Cassius popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #283, with 160 babies registered with the name. Its strongest year in the published records was 2023, with 174 births.

This profile covers 2,332 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 92% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 2,348 living people in the UK are called Cassius. 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

  • Cassius ranked #283 for boys in England and Wales in 2024, with 160 registrations.
  • The name peaked in 2023, when 174 boys were registered as Cassius.
  • Cassius ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #433 in 2021.
  • About 2,348 living people in the UK are estimated to have Cassius as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#283

2024

Births in 2024

160

Latest year

Peak year

2023

174 births

Estimated living

2,348

2026

Meaning

What does Cassius mean?

The name Cassius has its origins in ancient Roman culture, dating back to the 6th century BC. It is derived from the Latin word "cassis," which means "helmet." This suggests that the name may have been associated with military prowess or valor in battle.

The earliest recorded use of the name Cassius appears in ancient Roman texts and historical records. It was a common name among Roman nobility and aristocracy. One of the most famous historical figures with this name was Gaius Cassius Longinus, a Roman senator and one of the leading conspirators in the assassination of Julius Caesar in 44 BC.

During the Roman era, the name Cassius was also used by several Roman emperors and members of imperial families. For instance, Cassius Dio, a Roman historian and consul who lived from around 155 to 235 AD, was a notable figure who wrote an extensive work on Roman history.

As the Roman Empire expanded and Christianity spread, the name Cassius found its way into various regions and cultures influenced by Roman rule. In the Middle Ages, it was adopted by Christian families, particularly in Western Europe.

One of the most renowned individuals with the name Cassius was Cassius the Byzantine, a 6th-century mathematician and philosopher. He made significant contributions to the field of geometry and was known for his work on the study of conic sections.

Another famous bearer of the name was Cassius Clay, an American abolitionist and anti-slavery activist who lived from 1810 to 1903. He was a prominent figure in the movement to end slavery in the United States.

In the 20th century, the name Cassius gained further prominence with the birth of the legendary boxer Muhammad Ali, who was born Cassius Marcellus Clay Jr. in 1942. He later changed his name after converting to Islam but was known as Cassius Clay during his early boxing career.

Sourced from namecensus.com.

Popularity

Cassius over time

The chart below shows babies named Cassius 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 Cassius, the clearest high point is 2023. The latest England and Wales figure is 160 births in 2024, compared with 174 at the peak.

Babies born per year

Cassius
04487131174199620102024

Decades

Cassius by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Cassius 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 #282 817 5
2010s #396 1,096 10
2000s #728 372 10
1990s #1216 47 4

Geography

Where Cassius is most common

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

Cassius ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #433 in 2021.

Northern Ireland
3
Scotland
3

Across the UK

Cassius in Scotland and Northern Ireland

Scotland (NRS)

#727 in 2024

7 years of NRS records, 27 total registered

Northern Ireland (NISRA)

#433 in 2021

1 years of NISRA records, 3 total registered

Notable bearers

Famous people named Cassius

  • Cassius Henry

    singer

    British singer

    1979-

Related

Names similar to Cassius

FAQ

Cassius: questions and answers

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

In 2024, Cassius was ranked #283 for boys in England and Wales, with 160 births registered.

When was Cassius most popular?

The peak year on record was 2023, with 174 babies registered as Cassius in England and Wales.

What is the meaning and origin of Cassius?

A masculine Roman name derived from Latin meaning "hollow", "empty", or "vain".

How many people are called Cassius in the UK?

A total of 2,332 babies have been registered as Cassius across the 29 years of ONS England & Wales records shown here, plus 27 more in Scotland and 3 in Northern Ireland.

Where is Cassius most common?

In the latest published local rankings, Cassius ranks best in Northern Ireland, where it placed #433 in 2021. 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.