Head to head · Boys' names
Caspian vs Cassian
#491 vs #479 in 2025 · both climbing the charts fast
Cassian is a whisker ahead (#479 vs #491 in 2025) and both are climbing the charts fast. The records will not split these two — sound, story and your own last name will.
Cast your vote
Which one would you pick?
Your gut first, the numbers after — the split shows once you pick.
The tale of the tape
On the charts, Cassian leads 5 measures of 6; Caspian leads 1.
Ranks, counts and years are measured in the official US birth record; the classroom and living figures are estimates computed from it. The dot marks the side each measure favours on the charts — more common, not better.
What the records say
146 years of US births, drawn on one scale
Two curves, one scale
Who owned which decade
- 1990s: Caspian #6178, Cassian #9265 — Caspian higher
- 2000s: Caspian #4958, Cassian #7854 — Caspian higher
- 2010s: Caspian #1704, Cassian #4244 — Caspian higher
- 2020s: Caspian #653, Cassian #761 — Caspian higher
Caspian stood higher in every recorded decade — 4 of 4.
Rank by decade
| Decade | Caspian | Cassian |
|---|---|---|
| 1990s | #6178 | #9265 |
| 2000s | #4958 | #7854 |
| 2010s | #1704 | #4244 |
| 2020s | #653 | #761 |
Average national rank across each decade. A dash means the name sat outside the recorded top of that decade.
The names themselves
Meaning, roots, sound and the people who carried each
Where each name comes from
Caspian
of the Caspian Sea; from the ancient Caspii people
The route is clear — the sea took its name from the Caspii, a people of the Transcaucasus region, and the name came to English through the sea. What the tribal name itself meant in its own language was never recorded, so the trail stops there.
Caspii → Kaspion → Mare Caspium → Caspian
How it traveled
The Caspii were a people known to Greek and Roman geographers, and the great landlocked sea beside them took their name: Kaspion to the Greeks, Mare Caspium in Latin. For centuries afterward Caspian was purely geography — a place on a map, not a person.
Cassian
From the Roman family name Cassius; the meaning of Cassius itself is not settled
One reading connects Cassius to the Latin adjective cassus, 'empty, hollow, vain'. Another holds that Cassius, like many of the oldest Roman clan names, is pre-Latin — plausibly Etruscan — and simply cannot be translated. What is not in doubt is the shape of the word: Cassianus is the standard Latin way of saying 'of the Cassius family', the same pattern that gives Julianus from Julius and Aemilianus from Aemilius.
Cassius → Cassianus → Cassien → Cassian
How it traveled
Cassius was one of the old Roman clan names, and Cassianus was formed from it in the ordinary Roman way to mark descent or adoption. Christianity gave the longer form its long life: Cassian of Imola, a schoolmaster martyred in the fourth century and later taken as a patron of teachers, and John Cassian, whose Institutes and Conferences shaped Western monastic rule for a thousand years.
Where a reading is contested the note says so — this page does not turn a guess into a fact. The chain is each name's recorded forms, oldest first; the story is its opening, told in full on the name's own page.
Out loud, and in short
Caspian
KASS-pee-un
Stress on the first syllable, exactly as in the name of the sea. Some families say KASS-pyun, running the last two syllables together. Rarely misread, though it is sometimes heard as Casper on a first introduction.
- Cas — The most common short form in everyday use; also spelled Cass, which stands alone as a given name of its own.
- Cass — Informal; used for Cassius and Cassian too, so it may need clarifying among friends.
- Casp — Informal, mostly a playground or teammate shortening.
- Caz — Informal, more common in British and Australian usage than American.
Cassian
KASS-ee-un
Two pronunciations are both in real use: KASS-ee-un in three syllables, and KASH-un in two, the way 'Christian' collapses. Expect to state your preference more than once.
- Cass — The default short form in English, and one shared with Cassandra, Cassidy and Cassius, so it is not specific to this name.
- Cash — An informal stretch from the first syllable; also stands on its own as a given name in current American use.
- Cas — Same sound as Cass, spelled short; common in writing and messages.
- Cassie — Used affectionately by family; more often attached to girls' names, so many boys drop it early.
- Also Sonny.
One short form, two names
- Caspian and Cassian both shorten to Cass.
- Caspian and Cassian both shorten to Cas.
Short forms as recorded on each name’s own page. This is here so it is a decision rather than a discovery.
Is it right for you
The differences that decide it, laid out by what you want
Choose by what you want
Choose Caspian if you want…
- a name fewer children share#491 in 2025 — caspian will almost certainly be the only one in school
Choose Cassian if you want…
- a name most people already know#479 in 2025, 633 babies that year
- a name on the way upup 556 places on the charts in five years
Each line is a measured difference between the two names — a rank, a count, a recorded form — never a judgement of either. Save the one that answers your question; it lands on your shortlist.
The trade-offs, name by name
Caspian
Strengths
- The spelling is already familiar to anyone who has seen a world map or read Narnia, so it is usually written correctly the first time.
- It sits beside well-established Cas- names — Casper, Cassius, Cassian — which makes it easy for strangers to hear and repeat.
- Short forms come ready-made: Cas, Cass, Casp, all in real use and none invented for the purpose.
To consider
- It will be mistaken for Casper often enough to notice. The two names are unrelated in origin, but they share four letters and a rhythm, and people fill in what they expect to hear.
- The Narnia link is real and permanent. Many people will place the name in those books immediately, which is charming to some readers and a little bookish for others.
- It is climbing steadily, so a child born now may meet more Caspians as a teenager than as a toddler — still uncommon, but less singular than it is today.
Cassian
Strengths
- A documented line from Roman Cassius through Latin Cassianus to the modern spelling — an unbroken record of use going back to late antiquity.
- Recognizable across French, Italian, Spanish, Portuguese and Polish, each with a form of the same name.
- Short forms already exist and need no explaining: Cass, Cas, Cash.
To consider
- Two pronunciations compete — KASS-ee-un and KASH-un — and neither is wrong. Deciding which one your family uses before the name is public saves a lot of gentle correcting later.
- The Star Wars association is strong and recent for many adults, which can mean instant recognition or an instant comment, depending on the room. That connection will likely fade as the name settles in on its own.
- Almost everyone carrying it in the United States is very young, so the name currently reads as a small-child name rather than one with grown bearers around to normalize it.
Documented properties of each name — how it spells, travels and shortens — not opinions about the child.
With your last name
Say both in full. The notes are facts about letters and sound — a rhyme, a shared initial, the monogram — not a verdict on either name.
Type a last name to hear Caspian and Cassian in full.
Weighing the whole shortlist? Run the full comparison — up to eight names with your last name, initials, classroom projections and a printable report.
Decide together
Nobody names a baby alone
Still torn between Caspian and Cassian?
Put both to the vote.
One link to your partner, your parents, your sister. Each of them gets the two names, a one-tap answer and room to say why — and every reply lands in one place.
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More than two in the running? Settle it with a bracket or run the full comparison with your last name.
More head-to-heads
Same measures, different pair. Sixty more are dealt daily in the arena.
Lists these names appear on
Where Caspian and Cassian each sit in the library — alternatives in the same style, ranked by the same records.
Caspian or Cassian — the short answers
- Which is more popular, Caspian or Cassian?
- Cassian, in 2025: Cassian ranked #479 with 633 babies; Caspian ranked #491 with 614 babies.
- Which name is rising faster, Caspian or Cassian?
- Cassian. Over the last five years Caspian moved up 269 places; Cassian moved up 556 places.
- Which is the older name, Caspian or Cassian?
- Caspian entered the US charts in 1998; Cassian entered the US charts in 1997. On the American record, Cassian is the older name.
- How many people are named Caspian and Cassian?
- About 4,100 people named Caspian are estimated to be alive in the US today. About 2,900 people named Cassian are estimated to be alive in the US today.
- Do Caspian and Cassian share a nickname?
- Yes — both shorten to Cass and Cas, so in a house with both names the short form would not say which child is meant.
US figures from the Social Security Administration, 1880–2025. Votes are battle voters on this site, not the birth record. Data & methodology
Keep playing
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