O'Neill
/əʊˈniːl/
"o-neill" is a 6-letter English headword indexed on PlainSpell.
The verdict
“O'Neill” is a moderately-common English word, ranked #11,572 in English word frequency and used as a proper noun.
- #11,572
- frequency rank, English
- 7
- letters
- 6
- tracked misspellings
- 3
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A surname from Irish.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | O'Neill |
| Language | English |
| Part of speech | Proper noun |
| IPA | /əʊˈniːl/ |
| Letters | 7 |
| Frequency rank | #11,572 |
| Misspellings tracked | 6 |
| Confusable pairs | 3 |
| Source | Wiktionary (kaikki.org) |
Where “O'Neill” sits in English frequency
Spelling & Dictionary Insight
The English entry for O'Neill is 7 letters long, classified as a proper noun, and transcribed in the International Phonetic Alphabet as /əʊˈniːl/. Corpus data places it at rank #11,572 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 6 likely wrong-spelling variants for O'Neill, with forms such as "'oneill", "o'enill", and "o'nelil". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 3 confusable-pair relationships, "O'Reilly", "O'Neal", "O'Neil", a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: Anglicisation of an Irish surname meaning "descendant of Niall". The correct English form is O'Neill, spelled O-'-N-E-I-L-L.
Definition
- 1A surname from Irish.
- 2A city, the county seat of Holt County, Nebraska, United States.
Etymology
Anglicisation of an Irish surname meaning "descendant of Niall".
Common misspellings
Also misspelled as: 'oneill,o'enill,o'nelil,o'niell,o'nneill,on'eill
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of O'Neill - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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 "O'Neill"?
What does "O'Neill" mean?
What words are commonly confused with "O'Neill"?
How do you pronounce "O'Neill"?
What is the origin of the word "O'Neill"?
Is PlainSpell free to use?
Using “O'Neill”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is O-'-N-E-I-L-L - every other letter order is a misspelling in standard orthography.
- Say it as /əʊˈniːl/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “O'Reilly” - see the side-by-side comparison. O'Neill vs O'Reilly
- 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.