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Kaci

Feminine · “vigilant”

Kaci is overwhelmingly a girls’ name — 10,009 girls against 174 boys since 1880.

1965high 1989
#2117 in the U.S.given to only a few children a year
rare88 girls in 2025

Kaci respells Casey, the Irish Ó Cathasaigh — descendant of the vigilant one — from cathasach, watchful.

How old is the name Kaci?

Kaci first appears in US birth records in 1965 — 60 years ago. The typical Kaci alive today was born around 1997, making them about 28 years old. About 9,800 people named Kaci are estimated to be alive in the US today.

When was the name Kaci most popular?

Kaci peaked in 1989, reaching #610 nationally. Today it ranks #2117, 1,507 places below that high. See the whole 1989 chart.

Compare this nameMore “K” names

Kaci appears on this list:

I

Where it comes from

The story of Kaci

Ó Cathasaigh was a sept of several Irish regions, and the surname became a given name in America partly through the ballad of Casey Jones, a railway engineer killed in 1900. The Kaci spelling appears in the American registers for girls and is in current use.

Meaning

vigilant, watchful

Through Casey, from the Irish Ó Cathasaigh, from cathasach, 'vigilant' or 'watchful'. The root cath, 'battle', stands behind it. English record-keeping produced Casey. The Kaci spelling is modern American. The Irish is documented.

How the name formed

  1. cathasach
  2. Ó Cathasaigh
  3. Casey
  4. Kaci

Related forms: Casey · Kacey · Cathasach

Pronouncing Kaci

KAY-see

Two syllables, stress on the first. All the spellings of the sound are said identically.

Nicknames for Kaci

Moderate

KaceA clipping, sharp and one-syllable
Kace-KaceA reduplicated affectionate form, used inside families
II

What the data says

The long climb, and where it stands now

GIRLS NAMED · 1965–202534817403488819652025

US babies named Kaci per year from 1965 to 2025
AVERAGE RANK BY DECADE#1#10#100#1000#6101960s2020s

The same years in position rather than babies

First recorded
1965
Most girls named
1989348 — the highest on record
Peak rank
#610reached in 1989
Change vs 2024
−5.4%88 in 2025, from 93
Kaci sits in the rare tail. Its best year on record was 1989, with 348 girls. Today it is given to few enough children that it does not enter the ranked charts at all.

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.

Kaci in other languages

The same name elsewhere

  • Casey in English — spelling variant
  • Kacey in English — spelling variant
  • Cathasach in Irish — related form

Strongest US states over the last decade: Texas, Georgia, Louisiana.

Kacis among us

9,800

people named Kaci are estimated to be alive in the US today

About 1 girl in 18,264 born in 2025 was named Kaci

Estimated from SSA birth records and published actuarial life tables. Method

Spellings of Kaci

#2117
Kaci on the 2025 chart
#853
counting every spelling

The SSA counts spellings, not names. Kaci went to 88 girls in 2025, but Kacy and Kazi are the same name said out loud. Together the 3 spellings went to 107, which makes it the 853rd most-given girls’ name of the year — 1,264 places above the chart.

About 1 girl in 15,021 born in 2025 was given one of these spellings — against 1 in 18,264 for Kaci 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

III

Is it right for you

The Janeen test

Every popular name lives one long story — a climb, a peak, a slow settling back. Kaci's later chapters haven't been written yet, so we borrowed them: Janeen climbed just as high around 1969, and its whole arc is on record. Line the two peaks up, and Janeen's path sketches the road Kaci is walking now.

40%chance Kaci will feel dated by 2040
Kaci, aligned on its peakJaneen· peak 1969not yet written
#1#10#100#1000peak-30 yrs+60 yrsJaneen · #15088Kaci today
Kaci today is about where Janeen stood in 2005 — 36 years past a #610-sized peak. By 2020, Janeen had settled around #15088.
Ages quietlysteadyDates fast

Kaci 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 Kaci is headed

19652030

US babies named Kaci per year, 1965 to 2025, with a projection to 2030

Kaci should hold steady through 2030 — the curve is flat, and flat curves are the most predictable kind.

Steady-14% by 2030projected around #2,482 in 2030

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.

Kaci beside its neighbors

The names ranked closest to Kaci in 2025, in babies rather than position — the bars are to scale.

Kacithis name88#2117Anylah88#2117Krystal88#2117Jean88#2117Taelynn88#2117

US girls given each name in 2025.

The trade-off

Practical strengths
  • The vigilant meaning is concrete and undisputed.
  • Two clean syllables with no pronunciation risk.
  • It has a genuine Irish sept behind it.
What to consider
  • Casey is overwhelmingly the standard spelling.
  • At least five spellings of the sound are in circulation.
  • It is used for both sexes in America.

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Kaci

Feminine · #2117 in the U.S.

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Frequently asked

How many Kacis are there in the world?
No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 9,800 people named Kaci are estimated to be alive in the US today.
How do you spell Kaci?
Kaci is the most-used spelling in US records — 88 of the 107 babies given the name in 2025. The others recorded are Kacy and Kazi.
How popular is the name Kaci in 2025?
Kaci ranks #2117 among US girl names in 2025, with 88 babies given the name.
How rare is the name Kaci?
About 1 in every 18,264 US girls born in 2025 was named Kaci — 88 in all.
Will my child share the name Kaci with classmates?
Kaci will almost certainly be the only one in school.

Ranked beside Kaci

Names sitting at a similar level of popularity right now.

Anylah#2117 · Krystal#2117 · Jean#2117 · Taelynn#2117 · Adelia#2117 · Aoife#2117 · Chany#2117 · Nahomy#2117

Looking for what else is popular rather than what resembles Kaci? See the current top 100.

Choosing between Kaci and another name?

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US figures from the Social Security Administration. 1880–2025. Data & methodology

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