O'Callaghan
"o-callaghan" is a 10-letter English headword indexed on PlainSpell.
The verdict
“O'Callaghan” is an uncommon English word, ranked #50,121 in English word frequency and used as a proper noun.
- #50,121
- frequency rank, English
- 11
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A surname from Irish.
| Property | Value |
|---|---|
| Headword | O'Callaghan |
| Language | English |
| Part of speech | Proper noun |
| Letters | 11 |
| Frequency rank | #50,121 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “O'Callaghan” sits in English frequency
Spelling & Dictionary Insight
The English entry for O'Callaghan is 11 letters long, classified as a proper noun. Corpus data places it at rank #50,121 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "A surname from Irish.".
O'Callaghan doesn't appear in our generated misspelling index, suggesting the orthography follows predictable English patterns. We don't track a confusable pairing for this entry, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: Variant of Callahan. The correct English form is O'Callaghan, spelled O-'-C-A-L-L-A-G-H-A-N.
Definition
- 1A surname from Irish.
Etymology
Variant of Callahan.
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
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Using “O'Callaghan”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is O-'-C-A-L-L-A-G-H-A-N - every other letter order is a misspelling in standard orthography.
- 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.