Caius
- Gender
- Boy
- Say it
- KY-us
- Origin
- Latin
- UK rank, 2025
- #986 for boys
- US rank, 2025
- #927 for boys
Caius is a boys' name of Latin origin. In 2025 it ranked 986th for boys in the UK (34 babies) and 927th for boys in the US (254 babies).
What does Caius mean?
Latin: old spelling of Gaius
Gonville and Caius College, Cambridge, is pronounced 'Keys', after its second founder, John Caius.
Is Caius a girl's or a boy's name?
Caius is a boys' name. In 2025, it was given to 34 boys in the UK and 254 boys in the US. Too few girls were given it to be listed.
How popular is Caius in the UK?
- Rank in 2025
- 986th among boys
- Babies in 2025
- 34 about 1 in 8,800 boys
- Five-year trend
- Rising up 58% in five years
- Same name in a class
- under 1% chance among 15 boys
In 2025, 34 boys in the UK were named Caius, making it the 986th most popular name for boys. Five years earlier, in 2020, it was 1,007th. Its busiest year was 2023, with 36 boys.
Half of all the boys named Caius in the UK since 1996 were born between 2008 and 2021, the years shaded on the chart below.
In 2025, 77 boys in the UK were given Caius or a name that sounds the same. With every name's spellings counted this way, that ranks #521, up from #986 for this spelling alone.
Among boys in 2025, it was 976th in England and Wales and 395th in Northern Ireland.
Caius in the UK, year by year
| Year | Boys | Rank |
|---|---|---|
| 2025 | 34 | #986 |
| 2024 | 25 | #1,198 |
| 2023 | 36 | #950 |
| 2022 | 25 | #1,181 |
| 2021 | 15 | #1,686 |
| 2020 | 31 | #1,007 |
| 2019 | 17 | #1,543 |
| 2018 | 12 | #1,981 |
| 2017 | 27 | #1,141 |
| 2016 | 16 | #1,655 |
| 2015 | 20 | #1,367 |
| 2014 | 31 | #1,005 |
| 2013 | 19 | #1,398 |
| 2012 | 19 | #1,405 |
| 2011 | 26 | #1,095 |
| 2010 | 14 | #1,724 |
| 2009 | 15 | #1,582 |
| 2008 | 12 | #1,810 |
| 2007 | 15 | #1,540 |
| 2006 | 14 | #1,487 |
| 2005 | 13 | #1,522 |
| 2004 | 6 | #2,399 |
| 2003 | 7 | #2,054 |
| 2002 | 9 | #1,594 |
| 2001 | 15 | #1,103 |
| 2000 | 11 | #1,308 |
| 1999 | 11 | #1,267 |
| 1998 | 7 | #1,727 |
| 1997 | 13 | #1,111 |
| 1996 | 5 | #2,094 |
How popular is Caius in the US?
- Rank in 2025
- 927th among boys
- Babies in 2025
- 254 about 1 in 6,700 boys
- Five-year trend
- Rising up 42% in five years
- Same name in a class
- under 1% chance among 15 boys
In 2025, 254 boys in the US were named Caius, making it the 927th most popular name for boys. Five years earlier, in 2020, it was 1,209th. It first appears in the records in 1994.
2025 had the most boys named Caius of any year since it first appeared, in 1994.
Half of all the boys named Caius in the US since 1880 were born between 2014 and 2023, the years shaded on the chart below.
In 2025, 475 boys in the US were given Caius or a name that sounds the same. With every name's spellings counted this way, that ranks #583, up from #927 for this spelling alone.
- Caius 254
- Kaius 216
- Khaius 5
Caius in the US, year by year
| Year | Boys | Rank |
|---|---|---|
| 2025 | 254 | #927 |
| 2024 | 206 | #1,060 |
| 2023 | 140 | #1,346 |
| 2022 | 150 | #1,282 |
| 2021 | 138 | #1,339 |
| 2020 | 156 | #1,209 |
| 2019 | 137 | #1,327 |
| 2018 | 130 | #1,360 |
| 2017 | 110 | #1,510 |
| 2016 | 153 | #1,221 |
| 2015 | 138 | #1,287 |
| 2014 | 124 | #1,375 |
| 2013 | 109 | #1,492 |
| 2012 | 74 | #1,922 |
| 2011 | 44 | #2,698 |
| 2010 | 49 | #2,510 |
| 2009 | 43 | #2,799 |
| 2008 | 27 | #3,820 |
| 2007 | 29 | #3,589 |
| 2006 | 15 | #5,521 |
| 2005 | 23 | #3,937 |
| 2004 | 14 | #5,487 |
| 2003 | 15 | #5,030 |
| 2002 | 13 | #5,388 |
| 2001 | 16 | #4,670 |
| 2000 | 10 | #6,309 |
| 1999 | 7 | #7,867 |
| 1998 | 0 | – |
| 1997 | 0 | – |
| 1996 | 0 | – |
| 1995 | 0 | – |
| 1994 | 5 | #8,794 |
Names like Caius
Names given in the same years and the same naming tradition, with a similar sound.
Atlas, Remy, Enzo, Albie, Hudson, Cillian, Rowan, Cassius, Oakley, Cooper, Theo, Luca
Other spellings of Caius
More Latin names
Oliver, Olivia, Leo, Roman, Aurora, Emily, Florence, Mabel, Luna, Nora, Rosie, Emilia, Max, Nova, Lucy, Julian
Sources
Figures from Baby names in England and Wales (Office for National Statistics), Babies' first names (National Records of Scotland), Baby names (Northern Ireland Statistics and Research Agency) and Popular Baby Names (US Social Security Administration). Nameling last updated them on 20 October 2026. How the figures are worked out, and the data to download.
To cite this page: Nameling, “Caius: name meaning, origin and popularity”, https://www.nameling.co.uk/names/caius, updated 20 October 2026.