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Cassy

Girls' name

Diminutive of Cassandra

Cassy has been given to 1,996 babies in the U.S. since 1947. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1986, with 105 recorded.

Babies named Cassy, 2019

1 in 694,000

Cassy over time, 1880–2025

Girls
05010015018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Cassy: meaning, origin, and history

Diminutive of Cassandra

Deeper origin not confirmed in the cited records

What Cassy means

Cassy is a diminutive of Cassandra.

Documented naming usage and pronunciation

Cassy is used in English and French.

Another recorded pronunciation is /ˈkæs.i/ for Cassy.

Meaning behind the documented name family

The name developed through Cassy → Cassandra → Κασσάνδρα. The family’s proposed meaning is “to shine; excel over”, recorded in Ancient Greek with the source elements kékasmai.

Related names and everyday forms

Related names include Cassandra.

American usage and historical context

In the United States, 1,996 girls were recorded with the name Cassy between 1947 and 2019. Its highest annual count was 105 in 1986; its best national rank was #1,283 in 1986.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Cassy?

Cassy had fewer than 5 recorded uses in 2025, so these figures use 2019, the last year it was published.

Among all babies, 2019
1 in 694,000
5 of 3,472,229 births
Among girls only
1 in 336,000
<0.01% of girls
Rank, 2019
Unranked
Fewer than 5 uses
Coin-flip room size
481,354 kids
Even odds of a second one

Where Cassy sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2019 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 481,354 children born in 2019 and it's an even bet that one of them is another Cassy. In a class of 30 the chance is Under 1%.

When Cassys were born

Half of everyone ever recorded as Cassy was born before 1987 — so the typical Cassy is around 38 today.

Median birth year
1987
About 38 years old
Biggest decade
1980s
39.6% of all use
Born in the last 25 years
24.2%
Spread across generations
Recorded since 1950
1,984
People you could plausibly meet
Choose a decade

1980s — 39.6% of all recorded uses (790).

Is Cassy rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 1986 (105)
Years since peak
39
Years
Year-to-year steadiness
Volatile
25.5% average annual change
Best rank ever
#1,283
1986

Spellings of Cassy

Cassy is not the most common spelling — Cathy is, with 20.2% against Cassy's 0.24%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Cassy is used

Across 1910–2025, Cassy was most concentrated in California — about 1 in 100,000 girls, against 1 in 238,494 across all states with data. It was least common in Wisconsin (1 in —).

01 per 100,000

Most concentrated

  1. 1California1 in 100,000
  2. 2Michigan1 in 100,000
  3. 3Texas1 in 100,000
  4. 4Arkansas1 in —
  5. 5Colorado1 in —
  6. 6Florida1 in —
  7. 7Iowa1 in —
  8. 8Illinois1 in —

Shading is the share of that state's recorded girls given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Cassy has too little recent state data to map, so this covers all years from 1910.

Cassy around the world

Where Cassy ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1996–2017
    #5,765
    in 2017
  • Scotland
    1988–1988
    #577
    in 1988
  • France
    1989–2025
    #1,008
    in 2025
  • Canada
    1993–2021
    #3,354
    in 2021
  • South Australia
    1968–1997
    #464
    in 1997

Popularity data from Office for National Statistics, National Records of Scotland, Institut national de la statistique et des études économiques, Statistics Canada and Consumer and Business Services (South Australia). ONS, NRS data under Open Government Licence v3.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence. CBS SA data under CC BY 4.0.

Cassy by the numbers

The raw record for each sex the name is used for.

As a girl's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#1,283
1986
Peak year
1986
105 that year
First recorded
1947
Last recorded
2019
All-time count
1,996
Count in 2025
Under 5

Names similar to Cassy

Matched on shared beginnings and endings, similar length, and comparable popularity.

CassiCassiaCasieJessyPessyZissyKrissyCassadyCasseyMissyRossyCasiBessyCassideeCasonKassyCashmereCaseeCasiaCashCrissySissyChrissyCassidi

Sibling names for Cassy

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Cassy

Top names of 1986, Cassy's peak yearThe 1980s in fullOther names that peaked in 1986Girls' names starting with C