Cassidy

/ˈkæsɪdi/

//ˈkæsɪdi// name

By · According to Wiktionary data (CC BY-SA) ·

"cassidy" is a 7-letter English headword indexed on PlainSpell.

The verdict

“Cassidy” is a moderately-common English word, ranked #15,361 in English word frequency and used as a proper noun.

#15,361
frequency rank, English
7
letters
9
tracked misspellings
4
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A surname from Irish anglicized from Ó Caiside (“descendant of Caiside”). Caiside is a byname from Irish cas (“curly”) meaning “curly-haired”.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

Cassidy vs Cassie
71% similar
Cassidy vs Cassius
71% similar
Cassidy vs Cassini
71% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for Cassidy
PropertyValue
HeadwordCassidy
LanguageEnglish
Part of speechProper noun
IPA/ˈkæsɪdi/
Letters7
Frequency rank#15,361
Misspellings tracked9
Confusable pairs4
SourceWiktionary (kaikki.org)

Where “Cassidy” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). Cassidy lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for Cassidy is 7 letters long, classified as a proper noun, and transcribed in the International Phonetic Alphabet as /ˈkæsɪdi/. Corpus data places it at rank #15,361 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 5 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 9 likely wrong-spelling variants for Cassidy, with forms such as "acssidy", "casidy", and "casisdy". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 4 confusable-pair relationships, "Cassie", "Cassius", "Cassini", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From the Irish surname, Anglicized from Ó Caiside (“descendant of Caiside”), from cas (“curly-haired”). The correct English form is Cassidy, spelled C-A-S-S-I-D-Y.

Definition

  1. 1
    A surname from Irish anglicized from Ó Caiside (“descendant of Caiside”). Caiside is a byname from Irish cas (“curly”) meaning “curly-haired”.
  2. 2
    A surname from Irish, a rare anglicization of Mac Casarlaigh (Casserly).
  3. 3
    A male given name transferred from the surname.
  4. 4
    A female given name transferred from the surname, of modern American usage.
  5. 5
    A community in southern Vancouver Island, British Columbia, Canada.

Etymology

From the Irish surname, Anglicized from Ó Caiside (“descendant of Caiside”), from cas (“curly-haired”).

Common misspellings

Also misspelled as: acssidy,casidy,casisdy,cassdiy,cassiddy,cassidyy,cassiyd,ccassidy,csasidy

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of Cassidy - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

acssidy2casidy1casisdy2cassdiy2cassiddy1cassidyy1cassiyd2ccassidy1
Edit distance from "Cassidy"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "Cassidy"?
"Cassidy" is spelled C-A-S-S-I-D-Y. The IPA pronunciation is /ˈkæsɪdi/.
What does "Cassidy" mean?
As a proper noun, "Cassidy" means: A surname from Irish anglicized from Ó Caiside (“descendant of Caiside”). Caiside is a byname from Irish cas (“curly”) meaning “curly-haired”.
What words are commonly confused with "Cassidy"?
"Cassidy" is commonly confused with "Cassie", "Cassius", "Cassini". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "Cassidy"?
The IPA (International Phonetic Alphabet) transcription for "Cassidy" is /ˈkæsɪdi/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "Cassidy"?
From the Irish surname, Anglicized from Ó Caiside (“descendant of Caiside”), from cas (“curly-haired”). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “Cassidy”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is C-A-S-S-I-D-Y - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈkæsɪdi/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “Cassie” - see the side-by-side comparison. Cassidy vs Cassie
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list