Casyn
Masculine
Casyn is given to both — 510 boys and 26 girls since 1880. See other names given to both
Casyn is one of a set of names American families built around Case and Cass in the last twenty years: Casen, Cason, Caysen, Casyn. The -yn ending is the most recent of the spellings and does the same work the others do, which is to make a familiar sound belong to one family.
How old is the name Casyn?
Casyn first appears in US birth records in 2000 — 25 years ago. The typical Casyn is a kid of about 9 — this name's wave is very recent. About 500 people named Casyn are estimated to be alive in the US today.
When was the name Casyn most popular?
Casyn peaked in 2020, reaching #3202 nationally. Today it ranks #5208, 2,006 places below that high. See the whole 2020 chart.
Lists built from the same records:
Where it comes from
Origin, sound and short forms
Our story of Casyn
The -son and -sen and -syn endings came off English surnames and became free-floating pieces in American naming, attachable to almost any opening: Mason gave Maysen, Jackson gave Jaxson, and Case gave Cason and Casyn. What such a name inherits is a very precise moment, since spelling fashions move faster than sounds do. A Casyn was almost certainly born in the two-thousand-tens, and the spelling says so more exactly than the sound ever could.
Meaningnot established
Not established
Not documented. Case is an English surname from a maker of boxes or from Old French casse; Cass comes from Cassandra. Neither can be shown to be the parent of Casyn, whose ending was chosen for its look rather than from any source.
Pronouncing Casyn
KAY-sun
Two syllables, stress in front. The second is light and unstressed.
Nicknames for Casyn
Moderate
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 2000
- Most boys named
- 202035 — the highest on record
- Peak rank
- #3202reached in 2020
- Change vs 2024
- −18.2%18 in 2025, from 22
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Casyn in other languages
Strongest US states over the last decade: Texas.
Casyns among us
people named Casyn are estimated to be alive in the US today
About 1 boy in 94,893 born in 2025 was named Casyn
Estimated from SSA birth records and published actuarial life tables. Method
Spellings of Casyn
- #5208
- Casyn on the 2025 chart
- #778
- counting every spelling
The SSA counts spellings, not names. Casyn went to 18 boys in 2025, but Kasyn, Kacyn and Kasin and the rest below are the same name said out loud. Together the 5 spellings went to 150, which makes it the 778th most-given boys’ name of the year — 4,430 places above the chart.
- Kasyn89
- Kacyn22
- Casyn18
- Kasin16
- Kazyn5
About 1 boy in 11,387 born in 2025 was given one of these spellings — against 1 in 94,893 for Casyn itself.
Spellings are grouped by a fixed rule that folds interchangeable English spellings of one sound (ck/k, ph/f, x/ks, a non-initial y for i) and keeps vowels apart, so Sean and Shawn stay separate names. It errs towards splitting: a family here is never larger than the truth. SSA national data, 2025. Method
Is it right for you
What happens to a name after it peaks
The Nicolaas test
Every popular name lives one long story — a climb, a peak, a slow settling back. Casyn's later chapters haven't been written yet, so we borrowed them: Nicolaas climbed just as high around 1996, and its whole arc is on record. Line the two peaks up, and Nicolaas's path sketches the road Casyn is walking now.
Casyn 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 scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored
Casyn beside its neighbors
The names ranked closest to Casyn in 2025, in babies rather than position — the bars are to scale.
US boys given each name in 2025.
The trade-off
- Case works as a short form and is a complete name in its own right.
- Every sound in it is familiar, so nobody has to be taught it.
- The spelling is short and phonetic apart from the y.
- Cason, Casen, Caysen and Casyn are all in use and said identically.
- It is firmly of its decade and will date accordingly.
- There is no documented history behind it, only a pattern.
Nobody names a baby alone.
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Casyn
Masculine · #5208 in the U.S.
Frequently asked
- How many Casyns are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 500 people named Casyn are estimated to be alive in the US today.
- How do you spell Casyn?
- Casyn is one of 5 recorded spellings. Kasyn is the more common one — 89 births in 2025 against 18 for Casyn.
- How popular is the name Casyn in 2025?
- Casyn ranks #5208 among US boy names in 2025, with 18 babies given the name.
- How rare is the name Casyn?
- About 1 in every 94,893 US boys born in 2025 was named Casyn — 18 in all.
- Will my child share the name Casyn with classmates?
- Casyn will almost certainly be the only one in school.
Ranked beside Casyn
Names sitting at a similar level of popularity right now.
Rodger#5208 · Eusebio#5208 · Boy#5208 · Randal#5208 · Gable#5208 · Jessy#5208 · Kelby#5208 · Jens#5208
Looking for what else is popular rather than what resembles Casyn? See the current top 100.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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