Nameling

Kaci

Gender
Mostly girls
Say it
KAY-see
Origin
Irish
US rank, 2025
#2,117 for girls

Kaci is a name of Irish origin, meaning “vigilant”. In 2025 it ranked 2,117th for girls in the US (88 babies).

What does Kaci mean?

Irish: spelling of Casey, from Ó Cathasaigh

“vigilant”

A spelling of Casey, from the Irish surname Ó Cathasaigh, based on cathasach 'vigilant'.

Is Kaci a girl's or a boy's name?

In recent years, Kaci has been given to girls and boys, mostly girls. In 2025, it was given to 88 girls and 11 boys in the US.

How popular is Kaci in the UK?

No girls in the UK were given it in 2025, or too few to be listed. Its busiest year was 2002, with 249 girls.

Half of all the girls named Kaci in the UK since 1996 were born between 2003 and 2010, the years shaded on the chart below.

In 2021, 62% of the babies named Kaci in the UK were girls.

1998Busiest: 249 in 20022024
Kaci in the UK, year by year
YearGirlsRank
202412#2,323
202311#2,481
20226#3,728
20218#3,082
202010#2,566
201911#2,420
201820#1,628
201723#1,497
201637#1,037
201552#799
201447#874
201371#631
201291#523
2011126#400
2010114#423
2009123#392
2008169#313
2007164#312
2006182#286
2005174#284
2004154#303
2003210#239
2002249#187
2001158#284
20004#3,399
19990–
19983#4,026

How popular is Kaci in the US?

Rank in 2025
#2,117among girls
Babies in 2025
88about 1 in 18,000 girls
Five-year trend
Fallingdown 29% in five years
Same name in a class
under 1%chance among 15 girls

In 2025, 88 girls in the US were named Kaci, making it the 2,117th most popular name for girls. Five years earlier, in 2020, it was 1,642nd. Its busiest year was 1990, with 362 girls. It first appears in the records in 1965. 11 boys were also named Kaci in 2025 (7,190th for boys).

It has been given to fewer girls each year for the last 3 years. 2025 had fewer girls named Kaci than any year since 1977.

Half of all the girls named Kaci in the US since 1880 were born between 1988 and 2007, the years shaded on the chart below.

In 2025, 1,196 girls in the US were given Kaci or a name that sounds the same. With every name's spellings counted this way, that ranks #284, up from #2,117 for this spelling alone.

In 2025, 89% of the babies named Kaci in the US were girls.

1965Busiest: 362 in 19902025
Kaci in the US, year by year
YearGirlsRank
202588#2,117
202493#2,067
2023107#1,865
2022123#1,692
2021110#1,830
2020126#1,642
2019138#1,560
2018143#1,520
2017142#1,545
2016165#1,406
2015140#1,566
2014127#1,665
2013145#1,514
2012129#1,651
2011151#1,480
2010180#1,307
2009157#1,478
2008190#1,309
2007182#1,332
2006234#1,083
2005245#994
2004243#978
2003240#966
2002206#1,043
2001229#957
2000224#951
1999255#846
1998281#765
1997255#812
1996263#791
1995220#870
1994234#850
1993293#723
1992288#733
1991332#659
1990362#619
1989348#609
1988318#624
1987287#655
1986302#620
1985213#785
1984195#810
1983188#816
1982158#942
1981140#1,025
1980164#917
1979143#995
1978100#1,241
197778#1,429
197660#1,638
197562#1,586
197450#1,772
197343#1,913
197232#2,311
197132#2,375
197019#3,311
19695#7,469
196813#3,788
19678#4,981
19666#5,808
19655#6,538

Names like Kaci

Names given in the same years and the same naming tradition, with a similar sound.

Other spellings of Kaci

Names related to Kaci

More Irish names

Every Irish name

Sources

Figures from Baby names in England and Wales (Office for National Statistics), Babies' first names (National Records of Scotland), Baby names (Northern Ireland Statistics and Research Agency) and Popular Baby Names (US Social Security Administration). Nameling last updated them on 20 October 2026. How the figures are worked out, and the data to download.

To cite this page: Nameling, “Kaci: name meaning, origin and popularity”, https://www.nameling.co.uk/names/kaci, updated 20 October 2026.