Cassius
Boy name · #582 in 2025 · Rare
Cassius ranks #582 among American boys' names as of 2025, with 504 newborns given the name that year. A decade ago it stood at #644, so the name has been rising over the past ten years. Roughly one in every 3,571 boys born in 2025 was named Cassius.
The 145-year story
Cassius first appears in the Social Security records in 1880, when 17 boys received the name. Its peak came in 2021, when 607 boys were named Cassius — good for #487 that year. Today's parents encounter it on its way down the popularity curve, which for many parents is exactly the appeal. 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 Cassius per year. Source: SSA.
Unlock the 5-year forecast and compare Cassius against up to 5 other names.
Uniqueness: will there be another Cassius in class?
On our rarity read — which blends how common Cassius is today with its five-year momentum — the name reads as "rare". A high score means genuine rarity — your Cassius will likely be the only one in the room, with the occasional spelling-out as the price.
Where Cassius is most common
Like most names, Cassius's popularity isn't spread evenly across the country. Adjusted for how many boys are born in each state, Cassius is most common in WA (0.9 per 1,000), IN (0.7 per 1,000), UT (0.6 per 1,000), KY (0.5 per 1,000), VA (0.5 per 1,000) — against a national average of about 0.3 per 1,000 boys. These are per-capita rates, so they show where Cassius is a genuine regional favorite rather than just where the most babies are born.
Names like Cassius
Statistically, parents drawn to Cassius tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Caius, Kaius, Magnus, Ignatius, and Lucius.
CaiusKaiusMagnusIgnatiusLuciusKassiusAureliusMemphis
Rank history (last 25 years)
| Year | Babies named Cassius | Rank |
|---|---|---|
| 2025 | 504 | #582 |
| 2024 | 516 | #569 |
| 2023 | 509 | #575 |
| 2022 | 541 | #548 |
| 2021 | 607 | #487 |
| 2020 | 602 | #488 |
| 2019 | 554 | #514 |
| 2018 | 460 | #594 |
| 2017 | 467 | #582 |
| 2016 | 449 | #600 |
| 2015 | 406 | #644 |
| 2014 | 346 | #704 |
| 2013 | 300 | #757 |
| 2012 | 218 | #933 |
| 2011 | 240 | #873 |
| 2010 | 195 | #1005 |
| 2009 | 199 | #991 |
| 2008 | 213 | #946 |
| 2007 | 164 | #1115 |
| 2006 | 169 | #1058 |
| 2005 | 102 | #1442 |
| 2004 | 95 | #1456 |
| 2003 | 79 | #1591 |
| 2002 | 85 | #1483 |
| 2001 | 59 | #1871 |
Frequently asked questions
Is Cassius a popular boy name?
Cassius ranked #582 among boys in 2025 with 504 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #644.
When was the name Cassius most popular?
Cassius peaked in 2021, when 607 American boys received the name (ranked #487 that year). Since 2021 the name has declined from that high.
How rare is the name Cassius?
In 2025, roughly 1 in 3,571 newborn American boys was named Cassius. 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.