Head to head · Boys' names
Cassian vs Collin
#479 vs #493 in 2025
Cassian is a whisker ahead (#479 vs #493 in 2025), but the curves point different ways: Cassian is climbing the charts fast, Collin is holding its place on the charts.
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
The tape is even: Cassian and Collin each lead 3 measures of 6.
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
- 1890s: Cassian —, Collin #1079 — Collin higher
- 1900s: Cassian —, Collin #1068 — Collin higher
- 1910s: Cassian —, Collin #1837 — Collin higher
- 1920s: Cassian —, Collin #1891 — Collin higher
- 1930s: Cassian —, Collin #1905 — Collin higher
- 1940s: Cassian —, Collin #1143 — Collin higher
- 1950s: Cassian —, Collin #1081 — Collin higher
- 1960s: Cassian —, Collin #850 — Collin higher
- 1970s: Cassian —, Collin #587 — Collin higher
- 1980s: Cassian —, Collin #340 — Collin higher
- 1990s: Cassian #9265, Collin #157 — Collin higher
- 2000s: Cassian #7854, Collin #146 — Collin higher
- 2010s: Cassian #4244, Collin #260 — Collin higher
- 2020s: Cassian #761, Collin #472 — Collin higher
Collin stood higher in every recorded decade — 14 of 14.
Rank by decade
| Decade | Cassian | Collin |
|---|---|---|
| 1890s | — | #1079 |
| 1900s | — | #1068 |
| 1910s | — | #1837 |
| 1920s | — | #1891 |
| 1930s | — | #1905 |
| 1940s | — | #1143 |
| 1950s | — | #1081 |
| 1960s | — | #850 |
| 1970s | — | #587 |
| 1980s | — | #340 |
| 1990s | #9265 | #157 |
| 2000s | #7854 | #146 |
| 2010s | #4244 | #260 |
| 2020s | #761 | #472 |
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
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.
Collin
a young hound, or little Nicholas
Two unrelated lines meet here. The Gaelic Cailean means a whelp or young dog, which was a compliment in a hunting culture rather than an insult. The English Colin is Col, an old short form of Nicholas, with the French diminutive ending -in. Both were in use in Britain by the Middle Ages, and the spelling with two l's usually points to the Gaelic surname.
Cailean → Colin → Collin
How it traveled
Cailean Mòr Caimbeul died in the thirteenth century and gave the Campbell chiefs their Gaelic title, which is why the name is bound so tightly to that clan. Separately, English shepherds in Elizabethan poetry are constantly called Colin, from the French diminutive — the two Colins were already being confused four hundred years ago.
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
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.
Collin
KAH-lin
Two syllables, stress on the first. Britain says it that way too, though British Colins with one l often take a longer first vowel — KOH-lin — which is a real transatlantic difference and a source of small confusion.
- Col — The name without its ending, which is the medieval short form of Nicholas; plain and rarely written.
- Cal — A near-substitution rather than a shortening; a standing American name of its own and easier in speech.
Is it right for you
The differences that decide it, laid out by what you want
Choose by what you want
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
- a name with more sound in itCassian runs 3 syllables, Collin 2
- plenty of nickname options5 recorded short forms — Cass, Cash and Cas
Choose Collin if you want…
- a name fewer children share#493 in 2025 — collin will almost certainly be the only one in school
- a name holding steadyCollin is holding its place on the charts
- a name with fewer syllablesCollin is 2 syllables to Cassian'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
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.
Collin
Strengths
- Both possible origins are respectable and old, so there is something real to tell either way.
- It is entirely familiar to every English speaker and needs no explanation.
- Six letters, two syllables, and no difficulty of spelling or saying.
To consider
- Colin with one l is the older and internationally commoner spelling, and mail will use both.
- British and American speakers give the first vowel different lengths, which travelers notice.
- It was very well used in the 1990s, so a man of that age will have met several.
Documented properties of each name — how it spells, travels and shortens — not opinions about the child.
How each is likely to age
Cassian
58%chance Cassian feels dated by 2040
Cassian is climbing fast right now. Steep climbs tend to come with steep descents — the quicker a name arrives, the more firmly it belongs to its moment.
Collin
40%chance Collin feels dated by 2040
Collin sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.
A reading of where each name sits on the long naming cycle — computed, not measured, and explained on the data page.
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 Cassian and Collin 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 Cassian and Collin?
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 head-to-heads
Same measures, different pair. Sixty more are dealt daily in the arena.
Lists these names appear on
Where Cassian and Collin each sit in the library — alternatives in the same style, ranked by the same records.
Cassian or Collin — the short answers
- Which is more popular, Cassian or Collin?
- Cassian, in 2025: Cassian ranked #479 with 633 babies; Collin ranked #493 with 613 babies.
- Which name is rising faster, Cassian or Collin?
- Cassian. Over the last five years Cassian moved up 556 places; Collin moved down 28 places.
- Which is the older name, Cassian or Collin?
- Cassian entered the US charts in 1997; Collin entered the US charts in 1895. On the American record, Collin is the older name.
- How many people are named Cassian and Collin?
- About 2,900 people named Cassian are estimated to be alive in the US today. About 79,000 people named Collin are estimated to be alive in the US today.
- Will there be other Cassians or Collins in the classroom?
- Cassian will almost certainly be the only one in school. Collin 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
Sixty more head-to-heads are dealt in the arena every day — or line up Cassian, Collin and the rest of your shortlist with your last name in one printable report.
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