Kolby
Feminine · “Koli's farmstead”
Kolby is given to both — 1,351 girls and 11,650 boys since 1880. See Kolby as a boy nameSee other names given to both
Kolby is a respelling of Colby, an English place name left behind by Norse settlers: Koli's farmstead, with the -by ending that marks Scandinavian settlement all over the north of England.
How old is the name Kolby?
Kolby first appears in US birth records in 1978 — 47 years ago. The typical Kolby alive today was born around 2004, making them about 21 years old. About 1,300 people named Kolby are estimated to be alive in the US today.
When was the name Kolby most popular?
Kolby peaked in 2000, reaching #2672 nationally. Today it ranks #3577, 905 places below that high. See the whole 2000 chart.
Lists built from the same records:
Where it comes from
From Kolabyr to Kolby
The story of Kolby
Wherever you find an English place name ending in -by, Norse speakers once farmed there, and Colby in Norfolk, Cumberland and the Isle of Man all record it. Families took the name and carried it to America. Its use as a given name is recent and belongs with Carter, Cooper and Kolton, and the K spellings appeared alongside as the American exchange of C for K worked through the whole set.
Meaning
Koli's farmstead
From the Old Norse personal name Koli, generally connected to a word for coal or dark, and byr, a farmstead or village; the same -by ending closes Derby, Whitby and Rugby.
How the name formed
- Kolabyr
- Colby
- Kolby
Related forms: Colby · Koli
Pronouncing Kolby
KOHL-bee
Two syllables, first stressed. Kolby and Colby are said identically.
Nicknames for Kolby
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
- 1978
- Most girls named
- 200055 — the highest on record
- Peak rank
- #2672reached in 2000
- Change vs 2024
- +10.5%42 in 2025, from 38
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.
Kolby in other languages
The same name elsewhere
- Colby in English — spelling variant
- Koli in Norse — related form
Kolbys among us
people named Kolby are estimated to be alive in the US today
About 1 girl in 38,268 born in 2025 was named Kolby
Estimated from SSA birth records and published actuarial life tables. Method
Spellings of Kolby
- #3577
- Kolby on the 2025 chart
- #787
- counting every spelling
The SSA counts spellings, not names. Kolby went to 42 girls in 2025, but Colby, Kolbi and Colbi are the same name said out loud. Together the 4 spellings went to 173, which makes it the 787th most-given girls’ name of the year — 2,790 places above the chart.
About 1 girl in 9,291 born in 2025 was given one of these spellings — against 1 in 38,268 for Kolby 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 Sakina test
Every popular name lives one long story — a climb, a peak, a slow settling back. Kolby's later chapters haven't been written yet, so we borrowed them: Sakina climbed just as high around 1979, and its whole arc is on record. Line the two peaks up, and Sakina's path sketches the road Kolby is walking now.
Kolby 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 Kolby is headed
Kolby looks set to keep climbing gently, with roughly 24% more babies a year by 2030 if the current curve holds.
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.
Kolby beside its neighbors
The names ranked closest to Kolby in 2025, in babies rather than position — the bars are to scale.
US girls given each name in 2025.
The trade-off
- A settled place-name meaning with a genuinely legible Norse history.
- Read correctly on sight by every English speaker.
- Five letters and two syllables, quick to write.
- Colby is the standard spelling and is strongly read as a boys' name.
- A cheese carries the name, which will be mentioned.
- It is used for both sexes, so forms may guess wrong.
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What they receive
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Kolby
Feminine · #3577 in the U.S.
Frequently asked
- How many Kolbys are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 1,300 people named Kolby are estimated to be alive in the US today.
- How do you spell Kolby?
- Kolby is one of 4 recorded spellings. Colby is the more common one — 60 births in 2025 against 42 for Kolby.
- How popular is the name Kolby in 2025?
- Kolby ranks #3577 among US girl names in 2025, with 42 babies given the name.
- How rare is the name Kolby?
- About 1 in every 38,268 US girls born in 2025 was named Kolby — 42 in all.
- Will my child share the name Kolby with classmates?
- Kolby will almost certainly be the only one in school.
Ranked beside Kolby
Names sitting at a similar level of popularity right now.
Delphine#3577 · Evelyne#3577 · Ellanor#3577 · Gwenevere#3577 · Lian#3577 · Katya#3577 · Kolbi#3577 · Cherry#3577
Looking for what else is popular rather than what resembles Kolby? See the current top 100.
Choosing between Kolby and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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