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Caius

#927 in 2025Boys' name

Variant of Gaius

Caius has been given to 2,329 babies in the U.S. since 1994. In 2025 it ranked #927 of 13,926 boys’ names in use. Its peak year was 2025, with 254 recorded.

Babies named Caius, 2025

1 in 13,100

Caius over time, 1880–2025

Boys
010020030018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Caius: meaning, origin, and history

Variant of Gaius

Deeper origin not confirmed in the cited records

What Caius means

Caius is a variant of Gaius.

Meaning behind the documented name family

The name developed through Caius → Gaius. The family’s proposed meaning is “to rejoice”, recorded in the naming reference for Gaius.

Related names and everyday forms

Related names include Gaius.

American usage and historical context

In the United States, 2,329 boys were recorded with the name Caius between 1994 and 2025. Its highest annual count was 254 in 2025; its best national rank was #927 in 2025.

Over 5 years its rank rose, from #1,209 in 2020 to #927 in 2025. Over 10 years its rank rose, from #1,289 in 2015 to #927 in 2025.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

How common is Caius?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 13,100
254 of 3,315,165 births
Among boys only
1 in 6,720
0.01% of boys
Rank, 2025
#927
of 13,926 boys’ names in use
Coin-flip room size
9,048 kids
Even odds of a second one

Where Caius sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 5004%

Put another way: gather 9,048 children born in 2025 and it's an even bet that one of them is another Caius. In a class of 30 the chance is Under 1%.

When Caiuss were born

Half of everyone ever recorded as Caius was born before 2019 — so the typical Caius is around 6 today.

Median birth year
2019
About 6 years old
Biggest decade
2010s
45.9% of all use
Born in the last 25 years
99.1%
A modern name
Recorded since 1950
2,329
People you could plausibly meet
Choose a decade

2010s — 45.9% of all recorded uses (1,068).

Is Caius rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
+133
Places climbed
Rank vs 5 years ago
+282
Places climbed
Rank vs 10 years ago
+362
Places climbed
Births vs 10 years ago
1.84×
More babies than then
Share of its own peak
100.0%
Peak was 2025 (254)
Years since peak
Peaking now
At its all-time high
Year-to-year steadiness
Volatile
26.6% average annual change
Best rank ever
#927
2025

Spellings of Caius

Caius is not the most common spelling — Darius is, with 39.0% against Caius's 1.7%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Caius is used

Across 2016–2025, Caius was most concentrated in Minnesota — about 1 in 7,692 boys, against 1 in 13,646 across all states with data. It was least common in New Jersey (1 in 100,000).

113 per 100,000

Most concentrated

  1. 1Minnesota1 in 7,692
  2. 2Indiana1 in 8,333
  3. 3Oklahoma1 in 9,091
  4. 4Colorado1 in 10,000
  5. 5North Carolina1 in 10,000
  6. 6Ohio1 in 10,000
  7. 7Pennsylvania1 in 10,000
  8. 8California1 in 11,111

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings.

Caius around the world

Where Caius ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1996–2025
    #976
    in 2025
  • Scotland
    2011–2020
    #711
    in 2020
  • Northern Ireland
    2025–2025
    #395
    in 2025
  • France
    1925–1925
    #975
    in 1925
  • Canada
    2000–2024
    #1,181
    in 2024
  • South Australia
    1991–2013
    #754
    in 2013

Popularity data from Office for National Statistics, National Records of Scotland, Northern Ireland Statistics and Research Agency, Institut national de la statistique et des études économiques, Statistics Canada and Consumer and Business Services (South Australia). ONS, NRS, NISRA data under Open Government Licence v3.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence. CBS SA data under CC BY 4.0.

Notable people named Caius

People whose public names include Caius, backed by Wikidata given-name records and ordered by linked Wikimedia pages. The name may be a middle name.

People data from Wikidata (CC0). Fame is measured, not judged — the order reflects how widely each person is documented, not the U.S. birth records popularity this page is otherwise about.

Caius by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
#927
Trend vs 5 yrs ago
Up 282
Best rank ever
#927
2025
Peak year
2025
254 that year
First recorded
1994
Last recorded
2025
All-time count
2,329
Count in 2025
254

Names similar to Caius

Matched on shared beginnings and endings, similar length, and comparable popularity.

CaineKaiusCairoCaisonCainanCaidynCaioCainCaiAriusMariusCainenJariusCaisenCaidanGaiusJuniusCaideCailenCaidenCaigeSiriusAdariusCaisyn

Names with a curve like Caius

Not spelling — timing. These names rose, peaked and faded in the same years as Caius, so they read as being from the same moment even when they look nothing alike.

ZephyrCartierArhamLyamKnowledgeKarsynLenoxBenaiahBronxCaysenBastianZeus

Sibling names for Caius

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Caius

Top names of 2025, Caius's peak yearThe 2020s in fullOther names that peaked in 2025Boys' names starting with C