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

Casy is primarily a boy's name. It is also used as a girl's name, with 86 recorded births.

When was Casy most popular?

Casy reached its peak popularity in 1985 with 13 births that year. It is not currently in the top rankings.

How popular is the name Casy?

Casy is not currently in the top rankings but has been given to 122 babies in the U.S. since 1976. Its peak was in 1985.

Casy

An uncommon Irish pick — distinctive and rare.

Boy's name| Also girlsIrishNot ranked recently

Rare name

Meaning & Origin

Casy is a boy's and girl's baby name of Irish origin, a streamlined spelling variant of Casey — from the Irish Cathasach meaning 'vigilant' or 'watchful.' The Ó Cathasaigh was an important Irish clan, and the name became popular as a given name in America through the legend of Casey Jones, the heroic railroad engineer.

The Casy spelling drops a vowel for a more minimal written form. It carries all the vigilant, watchful energy of the classic Irish name in a slightly more streamlined package.

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Popularity Over Time

Casy has 17+ years of history in the U.S., first appearing in 1976.

Popularity by Decade

Decade-by-decade popularity data for Casy
Decade	Births	Avg Rank	Trend
1990s	48	#7537	▼
1980s	64	#5075	▲
1970s	10	#5955	—

Year-by-Year Data

View complete yearly data(17 years, 1976–1999)

Year-by-year popularity data for the name Casy
Year	Births	Rank	Change
1999	5	#10139	-2 (-28.6%)
1998	7	#7685	-4 (-36.4%)
1995	11	#5178	+5 (83.3%)
1994	6	#7921	0
1993	6	#7768	-1 (-14.3%)
1992	7	#6764	+1 (16.7%)
1990	6	#7306	-5 (-45.5%)
1988	11	#4196	+6 (120.0%)
1987	5	#7107	-3 (-37.5%)
1986	8	#4916	-5 (-38.5%)
1985	13	#3436	+5 (62.5%)
1984	8	#4620	+1 (14.3%)
1982	7	#5097	+1 (16.7%)
1981	6	#5604	0
1980	6	#5622	+1 (20.0%)
1979	5	#6184	0
1976	5	#5725	—

Source: U.S. Social Security Administration. Showing years with 5+ recorded births.

Casy as a Girl's Name

Casy is a true unisex name. As a girl's name, it has 86 recorded births since 1978.

Unranked

Current rank

Total births

1982

Peak year

Compare Casy as boy vs girl

Frequently Asked

Can Casy be used for both boys and girls?

Yes, Casy is used for both boys and girls. As a boy's name, it is not currently ranked. As a girl's name, it is not currently in the top rankings.

Last updated May 2026 · Data: U.S. Social Security Administration (1976–1999) · Methodology