Caius
Boy name · #928 in 2025 · Rare
Caius is currently the #928 boy name in the United States — 254 babies received it in 2025. A decade ago it stood at #1287, so the name has been rising over the past ten years. Roughly one in every 7,087 boys born in 2025 was named Caius.
The 31-year story
Caius first appears in the Social Security records in 1994, when 5 boys received the name. Its all-time peak is essentially right now: 2025, with 254 babies and a rank of #927. Names at their peak can keep climbing — or be one trend cycle from the long slide that eventually hits most popular names. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Babies named Caius per year. Source: SSA.
Unlock the 5-year forecast and compare Caius against up to 5 other names.
Uniqueness: will there be another Caius in class?
On our rarity read — which blends how common Caius is today with its five-year momentum — the name reads as "rare". A high score means genuine rarity — your Caius will likely be the only one in the room, with the occasional spelling-out as the price.
Where Caius is most common
Geography matters for names, and Caius is no exception. Adjusted for how many boys are born in each state, Caius is most common in IN (0.3 per 1,000), TN (0.3 per 1,000), OH (0.2 per 1,000), NC (0.2 per 1,000), CA (0.2 per 1,000) — against a national average of about 0.2 per 1,000 boys. These are per-capita rates, so they show where Caius is a genuine regional favorite rather than just where the most babies are born.
Names like Caius
Statistically, parents drawn to Caius tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Kaius, Cassius, Aurelius, Lucius, and Ignatius.
KaiusCassiusAureliusLuciusIgnatiusYunusAriusZeus
Rank history (last 25 years)
| Year | Babies named Caius | Rank |
|---|---|---|
| 2025 | 254 | #927 |
| 2024 | 206 | #1060 |
| 2023 | 140 | #1346 |
| 2022 | 150 | #1282 |
| 2021 | 138 | #1339 |
| 2020 | 156 | #1209 |
| 2019 | 137 | #1327 |
| 2018 | 130 | #1360 |
| 2017 | 110 | #1510 |
| 2016 | 153 | #1221 |
| 2015 | 138 | #1287 |
| 2014 | 124 | #1375 |
| 2013 | 109 | #1492 |
| 2012 | 74 | #1923 |
| 2011 | 44 | #2699 |
| 2010 | 49 | #2511 |
| 2009 | 43 | #2800 |
| 2008 | 27 | #3823 |
| 2007 | 29 | #3591 |
| 2006 | 15 | #5525 |
| 2005 | 23 | #3941 |
| 2004 | 14 | #5492 |
| 2003 | 15 | #5035 |
| 2002 | 13 | #5395 |
| 2001 | 16 | #4676 |
Frequently asked questions
Is Caius a popular boy name?
Caius ranked #928 among boys in 2025 with 254 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #1287.
When was the name Caius most popular?
Caius peaked in 2025, when 254 American boys received the name (ranked #927 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Caius?
In 2025, roughly 1 in 7,087 newborn American boys was named Caius. On our rarity scale (rarity blended with momentum) we classify it as "rare".
Data source: U.S. Social Security Administration name statistics, 1880–2025, national and state files. Counts reflect Social Security card applications; names with fewer than 5 occurrences in a state-year are suppressed by the SSA.