Kelvin
Masculine · “Narrow water”
Kelvin is overwhelmingly a boys’ name — 51,551 boys against 304 girls since 1880.
Kelvin began as water: a river that runs through Glasgow and past the old university there. In the nineteenth century it became a title, and from the title a unit of temperature that every science classroom still uses. Two syllables, one stress, no silent letters — KEL-vin lands the same way in English, Spanish and Portuguese.
How old is the name Kelvin?
Kelvin first appears in US birth records in 1912 — 113 years ago. The typical Kelvin alive today was born around 1980, making them about 45 years old. About 46,500 people named Kelvin are estimated to be alive in the US today.
When was the name Kelvin most popular?
Kelvin peaked in 1965, reaching #207 nationally. Today it ranks #1034, 827 places below that high. See the whole 1965 chart.
Where it comes from
From River Kelvin, Glasgow to Kelvin
The story of Kelvin
The name comes from a Scottish river rather than from a word for a person. When the physicist William Thomson was raised to the peerage in the late nineteenth century, he took his title from the Kelvin, the river beside Glasgow University where he taught — and because his work fixed the absolute temperature scale, that river's name is now a unit of measurement in every language of science. From there Kelvin moved into use as a given name, first in the English-speaking world and then far beyond it: it took particularly firm hold in Latin America and the Caribbean, and among Chinese speakers in Hong Kong and Singapore who choose an English name alongside their own. In the United States it has been given quietly and continuously for more than a century, strongest in Texas, California and Florida.
Meaningscholars disagree
"Narrow water" — from the River Kelvin in Scotland
What is certain is the river: Kelvin is the name of a waterway that joins the Clyde in Glasgow. The reading usually given for the river name is Gaelic caol abhainn, "narrow water," though place-name scholars have never fully settled it, and older forms leave room for other readings. So the geography is solid ground; the translation underneath it is not.
How the name formed
- River Kelvin, Glasgow
- Baron Kelvinpeerage title
- kelvinunit of temperature
- Kelvingiven name
Related forms: Kelvin · Kelvin · Kelvim · Kelvyn
Pronouncing Kelvin
KEL-vin
Stress on the first syllable. It reads the same in Spanish and Portuguese, which is part of why it settled so easily in Latin America; the main hazard is not pronunciation but hearing — Kelvin, Kevin and Calvin sit one letter apart.
Nicknames for Kelvin
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
- 1912
- Most boys named
- 19611,370 — the highest on record
- Peak rank
- #207reached in 1965
- Change vs 2023
- −7.8%214 in 2025, from 232
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.
Kelvin in other languages
The same name elsewhere
- Kelvin in Spanish — same name
- Kelvin in Portuguese — same name
- Kelvim in Portuguese (Brazil) — spelling variant
- Kelvyn in English — spelling variant
Strongest US states over the last decade: Texas, California, Florida.
Kelvins among us
people named Kelvin are estimated to be alive in the US today
About 1 boy in 7,982 born in 2025 was named Kelvin
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
What happens to a name after it peaks
The Loyd test
Every popular name lives one long story — a climb, a peak, a slow settling back. Kelvin's later chapters haven't been written yet, so we borrowed them: Loyd climbed just as high around 1919, and its whole arc is on record. Line the two peaks up, and Loyd's path sketches the road Kelvin is walking now.
Kelvin 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
Where Kelvin is headed
Kelvin should hold steady through 2030 — the curve is flat, and flat curves are the most predictable kind.
Medium confidence — fitted on official counts through 2025.
A damped-trend projection of the official birth data — a sketch of momentum, not a promise. Every name's forecast, ranked.
Kelvin beside its neighbors
The names ranked closest to Kelvin in 2025, in babies rather than position — the bars are to scale.
US boys given each name in 2025.
The trade-off
- Spelled the way it sounds, with no silent letters or optional vowels — most people get it right on the first try once they have heard it.
- Works unchanged across English, Spanish and Portuguese, which matters in bilingual families and across borders.
- Carries a real anchor in the wider world: the kelvin is taught in school science everywhere, so the name is never unfamiliar.
- Has an established, unforced short form in Kel, plus Kelv for casual use.
- Given steadily in the United States for over a century without ever crowding a classroom.
- Kevin and Calvin are close enough that Kelvin gets misheard and mis-typed by both. Expect to repeat it on the phone and to correct the occasional form.
- The temperature unit is a genuine association, not a vague one — some people will make the absolute-zero joke, particularly in science-minded company.
- Its history is short as names go: it reaches back to a nineteenth-century title and a river, not to a saint, a scripture or a long family line. If deep ancestry is what you are after, this one offers geography instead.
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What they receive
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Kelvin
Masculine · #1034 in the U.S.
Frequently asked
- How many Kelvins are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 46,500 people named Kelvin are estimated to be alive in the US today.
- How popular is the name Kelvin in 2025?
- Kelvin ranks #1034 among US boy names in 2025, with 214 babies given the name.
- How rare is the name Kelvin?
- About 1 in every 7,982 US boys born in 2025 was named Kelvin — 214 in all.
- Will my child share the name Kelvin with classmates?
- Kelvin will almost certainly be the only one in school.
Ranked beside Kelvin
Names sitting at a similar level of popularity right now.
Zavier#1034 · Carmine#1034 · Avraham#1034 · Ivaan#1030 · Blaise#1038 · Brodie#1038 · Kellan#1030 · Ernest#1038
Looking for what else is popular rather than what resembles Kelvin? See the current top 100.
Choosing between Kelvin and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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