Head to head · Boys' names
Caspian vs Sean
#491 vs #489 in 2025
Sean is a whisker ahead (#489 vs #491 in 2025), but the curves point different ways: Sean is stepping back from its peak, Caspian is climbing the charts fast. On momentum, Caspian has the edge.
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, Sean 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
- 1920s: Caspian —, Sean #3805 — Sean higher
- 1930s: Caspian —, Sean #2460 — Sean higher
- 1940s: Caspian —, Sean #886 — Sean higher
- 1950s: Caspian —, Sean #365 — Sean higher
- 1960s: Caspian —, Sean #107 — Sean higher
- 1970s: Caspian —, Sean #40 — Sean higher
- 1980s: Caspian —, Sean #42 — Sean higher
- 1990s: Caspian #6178, Sean #45 — Sean higher
- 2000s: Caspian #4958, Sean #70 — Sean higher
- 2010s: Caspian #1704, Sean #201 — Sean higher
- 2020s: Caspian #653, Sean #407 — Sean higher
Sean stood higher in every recorded decade — 11 of 11.
Rank by decade
| Decade | Caspian | Sean |
|---|---|---|
| 1920s | — | #3805 |
| 1930s | — | #2460 |
| 1940s | — | #886 |
| 1950s | — | #365 |
| 1960s | — | #107 |
| 1970s | — | #40 |
| 1980s | — | #42 |
| 1990s | #6178 | #45 |
| 2000s | #4958 | #70 |
| 2010s | #1704 | #201 |
| 2020s | #653 | #407 |
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.
Sean
God is gracious
Irish Sean, from Norman French Jehan, from Latin Iohannes and Hebrew Yochanan: God is gracious. The accent over the a in Irish marks a long vowel. Without it, sean is an ordinary Irish adjective meaning old, so the accent is doing real work.
Yochanan → Iohannes → Jehan → Sean
How it traveled
The J sound did not exist in Irish and the letter still is not part of the traditional Irish alphabet, which has eighteen letters. When Norman French brought Jehan to Ireland in the twelfth century, Irish substituted the nearest thing it had, which was the sh sound written with a slender s, and the name has been Sean ever since.
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.
Sean
SHAWN
One syllable, with the vowel of dawn. In Northern Ireland and parts of Ulster it is closer to SHAN, with the vowel of hand, and both are correct in their own regions.
- Seanie — The Irish diminutive, used at home and among friends.
- Shay — A separate Irish name often used as a clip; serves either child.
- Johnny — The English cousin, used by Seans who anglicize.
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 on the way upup 269 places on the charts in five years
- a name with more sound in itCaspian runs 3 syllables, Sean 1
Choose Sean if you want…
- a name past its most crowded yearsSean is stepping back from its peak
- a name with fewer syllablesSean is 1 syllable to Caspian's 3
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.
Sean
Strengths
- A settled Hebrew meaning shared with the largest name family in Europe.
- One syllable, which very few names of this history manage.
- It is the Irish spelling rather than a phonetic English one, which settles the question of which came first.
To consider
- Shawn and Shaun are both common and this spelling will be read wrong by anyone meeting it cold.
- The accent that distinguishes the name from the word for old cannot be typed on most American forms.
- The very few girls given this spelling will be read as boys on every form.
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 Sean 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 Sean?
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
- Water names that flow
- Classics hiding in plain sight
- Generation X names (born 1965–1980)
- Millennial names (born 1981–1996)
- all guides
Where Caspian and Sean each sit in the library — alternatives in the same style, ranked by the same records.
Caspian or Sean — the short answers
- Which is more popular, Caspian or Sean?
- Sean, in 2025: Sean ranked #489 with 616 babies; Caspian ranked #491 with 614 babies.
- Which name is rising faster, Caspian or Sean?
- Caspian. Over the last five years Caspian moved up 269 places; Sean moved down 155 places.
- Which is the older name, Caspian or Sean?
- Caspian entered the US charts in 1998; Sean entered the US charts in 1925. On the American record, Sean is the older name.
- How many people are named Caspian and Sean?
- About 4,100 people named Caspian are estimated to be alive in the US today. About 398,000 people named Sean are estimated to be alive in the US today.
- Will there be other Caspians or Seans in the classroom?
- Caspian will almost certainly be the only one in school. Sean will almost certainly be the only one in school.
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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