Nameling

Kacy

Gender
Girl
Say it
KAY-see
Origin
Irish
US rank, 2025
#8,360 for girls

Kacy is a girls' name of Irish origin, meaning “vigilant”. In 2025 it ranked 8,360th for girls in the US (12 babies).

What does Kacy mean?

Irish: spelling of Casey, from Ó Cathasaigh

“vigilant”

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

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

Kacy is a girls' name. In 2025, it was given to 12 girls and 10 boys in the US.

How popular is Kacy in the UK?

No girls in the UK were given it in 2025, or too few to be listed. Its busiest year was 2005, with 46 girls.

Half of all the girls named Kacy in the UK since 1996 were born between 2004 and 2010, the years shaded on the chart below.

In 2013, 73% of the babies named Kacy in the UK were girls.

1998Busiest: 46 in 20052023
Kacy in the UK, year by year
YearGirlsRank
20231#7,582
20220–
20211#7,491
20209#2,766
20190–
20184#4,914
20176#3,774
20164#4,980
20158#3,114
201410#2,618
20138#3,060
201214#2,103
201118#1,696
201019#1,635
200926#1,245
200839#908
200741#848
200634#932
200546#724
200427#1,006
200328#951
200215#1,399
200114#1,461
200010#1,792
19994#3,374
19983#4,026

How popular is Kacy in the US?

Rank in 2025
#8,360among girls
Babies in 2025
12about 1 in 130,000 girls
Five-year trend
Fallingdown 41% in five years
Same name in a class
under 1%chance among 15 girls

In 2025, 12 girls in the US were named Kacy, making it the 8,360th most popular name for girls. Five years earlier, in 2020, it was 5,663rd. Its busiest year was 1990, with 196 girls. It first appears in the records in 1956. 10 boys were also named Kacy in 2025 (7,675th for boys).

Half of all the girls named Kacy in the US since 1880 were born between 1983 and 2000, the years shaded on the chart below.

In 2024, 67% of the babies named Kacy in the US were girls.

1956Busiest: 196 in 19902025
Kacy in the US, year by year
YearGirlsRank
202512#8,360
202420#5,959
202311#8,984
202216#6,979
202122#5,569
202021#5,663
201925#5,161
201827#4,886
201735#4,146
201640#3,777
201540#3,766
201443#3,583
201332#4,420
201241#3,781
201150#3,266
201049#3,305
200947#3,459
200853#3,157
200783#2,311
200679#2,375
200593#2,013
200498#1,908
2003109#1,732
200293#1,895
200169#2,300
200089#1,896
199998#1,676
199888#1,771
199793#1,680
1996141#1,236
1995141#1,211
1994144#1,214
1993127#1,316
1992180#1,032
1991178#1,030
1990196#955
1989176#979
1988164#999
1987174#941
1986160#984
1985157#976
1984143#1,004
1983152#959
1982149#988
1981136#1,050
1980138#1,034
1979150#964
1978122#1,078
197768#1,576
197665#1,551
197570#1,459
197451#1,760
197349#1,773
197244#1,890
197132#2,375
197030#2,450
196926#2,585
196814#3,609
196714#3,483
196618#2,936
196510#4,201
19640–
19630–
196212#3,781
19618#4,881
19600–
19597#5,030
19588#4,519
195710#3,929
19569#4,160

Names like Kacy

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

Keira Cassidy Erin Kiara Caoimhe Aoibheann Teagan Eden Caragh Kennedy Brianna Raegan

Names related to Kacy

Kacey Kaci Kayci Kayce Kace

More Irish names

Oscar Rowan Rory Maeve Finn Aiden Ryan Nolan Quinn Orla Cody Ronan Connor Declan Casey Callan

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, “Kacy: name meaning, origin and popularity”, https://www.nameling.co.uk/names/kacy, updated 20 October 2026.