Colby
Masculine · Old Norse roots · “Koli's farmstead”
Colby is given to both — 53,971 boys and 4,184 girls since 1880. See Colby as a girl nameSee other names given to both
Colby began as a place: a handful of small English villages whose names were laid down by Norse settlers, then a family name carried out of them, then a first name. It is two clean syllables that land the same way in every mouth — KOHL-bee — and it has been on American birth records without a break since the nineteenth century.
How old is the name Colby?
Colby first appears in US birth records in 1888 — 137 years ago. The typical Colby alive today was born around 2000, making them about 25 years old. About 52,000 people named Colby are estimated to be alive in the US today.
When was the name Colby most popular?
Colby peaked in 2001, reaching #99 nationally. Today it ranks #615, 516 places below that high. See the whole 2001 chart.
Where it comes from
From Koli / kol (Old Norse) to Colby
The story of Colby
Northern and eastern England were settled by Norse speakers who left their vocabulary in the landscape, and the ending -by — farm, settlement — is one of the clearest fingerprints they left; Whitby, Grimsby and Colby all share it. Villages called Colby in Norfolk, Cumbria and on the Isle of Man gave their name to families who moved away from them, in the ordinary English way of turning a place into a surname. From there Colby traveled to America as a family name and, like Bradley, Cody and Riley, crossed over into use as a first name. Colby College in Maine has carried it in public view for well over a century.
Meaningscholars disagree
Koli's farmstead — from an Old Norse personal name plus býr, 'farm, settlement'
The second element, býr ('farm, village'), is not in doubt. The first is usually read as the Old Norse personal name Koli, giving 'Koli's settlement'; some place-name scholars read it instead as kol, 'coal' or 'charcoal', giving 'the charcoal farm'. Both point to the same villages in Norfolk, Cumbria and Lincolnshire.
How the name formed
- Koli / kolOld Norse
- býrOld Norse: farm, settlement
- ColbyEnglish village name
- ColbyEnglish surname
- Colbygiven name
Pronouncing Colby
KOHL-bee
Stress on the first syllable. Nobody has to ask twice, and the spelling follows the sound — though Kolby and Colbie both exist, so people may check which one you use.
Nicknames for Colby
High
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
- 1888
- Most boys named
- 20032,170 — the highest on record
- Peak rank
- #99reached in 2001
- Change vs 2023
- −2.6%455 in 2025, from 467
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.
Colby in other languages
Strongest US states over the last decade: Texas, California, Florida.
Colbys among us
people named Colby are estimated to be alive in the US today
About 1 boy in 3,754 born in 2025 was named Colby
Estimated from SSA birth records and published actuarial life tables. Method
Spellings of Colby
- #615
- Colby on the 2025 chart
- #447
- counting every spelling
The SSA counts spellings, not names. Colby went to 455 boys in 2025, but Kolby is the same name said out loud. Together the 2 spellings went to 620, which makes it the 447th most-given boys’ name of the year — 168 places above the chart.
- Colby455
- Kolby165
About 1 boy in 2,755 born in 2025 was given one of these spellings — against 1 in 3,754 for Colby 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 Roland test
Every popular name lives one long story — a climb, a peak, a slow settling back. Colby's later chapters haven't been written yet, so we borrowed them: Roland climbed just as high around 1924, and its whole arc is on record. Line the two peaks up, and Roland's path sketches the road Colby is walking now.
Colby 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 Colby is headed
Colby should hold steady through 2030 — the curve is flat, and flat curves are the most predictable kind.
High 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.
Colby beside its neighbors
The names ranked closest to Colby in 2025, in babies rather than position — the bars are to scale.
US boys given each name in 2025.
The trade-off
- Spelling and sound match: heard once, it is usually written correctly the first time.
- Cole is a ready-made short form that already works as a full name, giving a formal and an informal register.
- An unbroken run on US birth records stretching back to the nineteenth century — familiar without being crowded.
- Surname-style, so it sits comfortably beside most last names and reads well on a name badge or a roster.
- Colby cheese, named for a town in late nineteenth-century Wisconsin, is the association most Americans reach for first. It is mild and harmless as jokes go, but it will come up.
- Because it is still very much a surname elsewhere, Colby paired with another surname-type last name can read as two last names — worth saying the full combination out loud.
- Kolby and Colbie exist as alternate spellings, so expect the occasional 'C or K?' at the pharmacy counter.
- US records list Colby overwhelmingly for boys; a girl named Colby is not unheard of, but she would be doing some quiet explaining on forms.
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Colby
Masculine · Old Norse roots · #615 in the U.S.
Frequently asked
- How many Colbys are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 52,000 people named Colby are estimated to be alive in the US today.
- How do you spell Colby?
- Colby is the most-used spelling in US records — 455 of the 620 babies given the name in 2025. The others recorded are Kolby.
- How popular is the name Colby in 2025?
- Colby ranks #615 among US boy names in 2025, with 455 babies given the name.
- How rare is the name Colby?
- About 1 in every 3,754 US boys born in 2025 was named Colby — 455 in all.
- Will my child share the name Colby with classmates?
- Colby will almost certainly be the only one in school.
Ranked beside Colby
Names sitting at a similar level of popularity right now.
Yahya#615 · Albert#614 · Harlan#617 · Jaiden#617 · Gunnar#612 · Jakari#612 · Kyro#611 · Westley#619
Looking for what else is popular rather than what resembles Colby? See the current top 100.
Choosing between Colby and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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