Kaci

♂ Boy

Pronounced KAY-see /ˈkeɪ.si/High

Meaning: A spelling of Casey — from the Irish O Cathasaigh, 'a descendant of Cathasach (the vigilant/watchful one)'; used for both sexes; here for boys; routes layeredLow

In 30 seconds: Vigilant; watchful: Kaci spells Casey — 'vigilant; watchful'. Crisp, modern, and warm. Used for both sexes (here for boys; said 'KAY-see').

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Origin LowIrish

MeaningA spelling of Casey — from the Irish O Cathasaigh, 'a descendant of Cathasach (the vigilant/watchful one)'; used for both sexes; here for boys; routes layered

U.S. rank (2025)#7411 ↘ Falling

2025 U.S. births11 boys (0.00% of U.S. boys)

Peak year2022

Total births (all-time)≈ 174

Popularity in the U.S. · SSA data

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Kaci is a spelling of Casey — from the Irish O Cathasaigh, 'a descendant of Cathasach', the vigilant or watchful one (routes layered, which we note). A crisp, modern name, used for both sexes, here for boys (slug distinguished).

In the U.S. it registers thinly for boys. Rare, vigilant-and-watchful at the root, and modern.

Did you know? Casey comes from the Irish O Cathasaigh, 'a descendant of Cathasach', the vigilant or watchful one — Kaci is a spelling, crisp and modern, used for both sexes (here for boys; the routes are layered; said 'KAY-see').

Overall data confidence 42%

References — Casey — Irish surname; routes layered

Variations

CaseyKaceyKasey

Nicknames

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Famous Bearers

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If you like Kaci…

Casey— the standard spelling

Kasey— a fellow spelling

Corey— a sound-neighbor Irish unisex boys' name

Kacey— shares Kaci's Irish roots

Kelly— a fellow Irish choice

Explore names like Kaci

By themeuncertain unisex irish

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Frequently Asked

What does the name Kaci mean?

Kaci spells Casey — Irish 'a descendant of the vigilant/watchful one'; the routes are layered.

How do you pronounce Kaci?

It's said KAY-see /ˈkeɪ.si/ — two syllables, stress on the first.

Is Kaci a boy or girl name?

Kaci is used for both sexes; this page covers its use as a boy's name.

How popular is Kaci?

Kaci is a rare name for boys in the U.S.