Caius is a distinctive choice, ranked #976 in 2025. Your child is likely to be the only Caius in their class.
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UK Rank 2025
#976
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About the Name Caius
Caius has seen a notable decline in recent years, dropping 139 places in five years. It was most popular in 2023 at #890 — parents choosing it today are making a deliberately counter-trend decision. The name has been a consistent presence in UK records since 1996.
Caius is uncommon in the UK, so your child is very likely to be the only Caius in their class.
⭐ Famous People Named Caius
Caius Faatili — Caius Faatili is a New Zealand professional rugby league footballer who plays as a prop for Wakefield Trinity in the Super League.
Caius Novac — Caius Novac was a Romanian football defender.
Thomas Caius — Thomas Caius was an Oxford academic and administrator.
Biographical summaries are shortened from Wikipedia and are used under the CC BY-SA 4.0 licence; those summaries remain available under that same licence.
Frequently Asked Questions
Common questions about the name Caius
Unlikely. With around 31 UK babies named Caius per year, your child will almost certainly be the only Caius in their class, and possibly the only one in the whole school.
Caius has been fairly steady, ranked #976 in 2025 against #993 in 2020. Its best recorded position was #890 in 2023.
Caius is a distinctive choice sitting outside the mainstream UK top names. Parents choosing less common names often find their children appreciate the individuality as they grow up, rarely needing to add an initial to distinguish themselves.
Notable people named Caius include: Caius Faatili, Pope Caius and Caius of Korea. Short summaries for each appear below.
Caius does not appear in the US top 1,000 baby names, making it a distinctively British choice — your child is unlikely to encounter American Caiuss in the wild.
31
UK babies named Caius (2025)
< 1
Expected classmates with this name (class of 28)
~0.0
In a school of 600
↑ 17 places
Rank change (last 5 years)
🏫 Who else is in the room?
In a typical UK class of 28, highlighted children share the name Caius
Almost certainly the only Caius in the class
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UK Popularity (1996–2025)
Rank and birth count · ONS official data
No US data available for this name
✨ Similar names to Caius
Names with a similar style — each with their own classroom story
Caius of Korea is the 128th of the 205 Catholic Martyrs of Japan beatified by Pope Pius IX on 7 July 1867, after he had canonized the Twenty-six Martyrs of Japan five years before on 8 June 1862.