Caius

Caius - A very unique male name

Caius appeared on the charts for the first time in 2005 on position #3156. In this article you'll learn the history of this name, statistics, see famous people named Caius and more.
Are you having a baby or looking to learn more about the name Caius? Our experts and editorial staff have gathered trends and insights for 30,000+ baby names over the last 100 years -- And on this page you will learn everything you ever wanted to know about the name Caius. The baby boy name Caius was given to 197 baby boys in 2025, ranking #954 on the national boy baby name top chart.


With that position 1 in 7,443 baby boys were given this name - making this a very unique male name according to our Popularity Score algorithm. Caius peaked in popularity 1 years ago in 2025 on position 954.

Famous with this name

How would you rate Caius, 1-5?

Caius is currently topping the charts in...

Did you know that popularity can vary a lot between states? Caius is currently topping the baby name charts in Maryland at position #578 - and is the least popular in New York at position #1,809.

Why care about state specific baby name charts? It could be that a name that is very popular on the national overall charts is less (or even more) popular where you live. So make sure you check out the state specific charts below and find out how popular or unique Caius is where you live.

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Caius origin and meaning

Roman (Latin) — origin uncertain

Uncertain — a Roman praenomen of probably Etruscan origin; the link to Latin gaudere, 'to rejoice,' is a folk derivation

Caius — more often written Gaius — was one of the most common first names of ancient Rome, borne by Gaius Julius Caesar among many others. Its real origin is lost, most likely Etruscan. The Caius spelling is familiar from Shakespeare and from Cambridge's Gonville and Caius College (pronounced 'Keys'), and the name has newly entered US use since 2005, reaching its highest point in 2025.

Origin uncertain

Caius is a 5 letter name with 2 syllables.

To see famous people named Caius, pop culture references for the name Caius and nicknames & variations - visit Nameberry or Wikipedia.

Similar to Caius

We've found the following names that sound similar to Caius, sorted by popularity.

Chase / Casey / Cash / Chuck / Coy / Case / Chaz / Cassius / Chace / Cy /

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Name statistics

Most parents-to-be know if they want a popular or unique name, and with these charts and data tables you can easily get a better understanding of how popular or unique this name is.

With a quick glance you can easily tell if this name is increasing or declining in popularity - But note that its current popularity can actually differ a lot from state to state.

Chart position per year (visualized)

Chart position per state (visualized)

Chart position per year (table view)

Chart position per state (table view)

Even more about Caius

These are some of the common questions you may want to have answered to know if this is the perfect name for your baby.

Is Caius a common or unique name?

By analyzing the number of births and frequency of this name we've determined that it's currently a very unique male name.

What is the number of syllables for the name Caius?

2 syllables. Why is this important? One of the things that makes a baby name sound good and have a nice rythm is the number of syllables - and especially the number of syllables along with the syllable count for your last name. A simple rule is to avoid having the same number of syllables in your first, middle and last name.

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Pronunciation

KY-us · /ˈkaɪəs/
Most say KY-us, but Gonville and Caius College in Cambridge pronounces Caius as 'Keys' — a genuine, famous split.

Around the world

No traditional forms in other languages — this name was created in America in our own time.

Spellings and nicknames

• Gaius — The more standard Roman spelling, a separate name in the data
• Kaius — A modern phonetic spelling

Nicknames: CaiKai

Famous bearers

None yet — the name first appears in the data in 2005, and its oldest bearers are still young.

Style

Classic

Why parents choose it

Parents choose Caius for authentic Roman weight in a short, striking form — an ancient alternative to Kai or Cyrus. It feels scholarly and bold.

Worth knowing

• Spelling and pronunciation both trip people up (KY-us, GUY-us and 'Keys' are all heard)
• Gaius-spelled Romans, including Julius Caesar, are not bearers of this spelling