Oconnor
surname · Latin script
(measured from records)Officially recorded in 15 countries · latest register: Census Bureau, 2020
Oconnor is a surname written in the Latin script, with more bearers in the United States than in any other country: 77,923 people, counted by the Census Bureau in 2010. In Ireland it is the 14th most common surname. Oconnor is also written โอคอนเนอร in Thai and 오코너 in Korean (Hangul).
- IEIreland≈1 in 1.6K(inferred from the name graph)
- AUAustralia≈1 in 2.7K
- GBUnited Kingdom≈1 in 3.4K
carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). Countries with no figure are shown too: flat where a national register lists the name without counting it, hatched where only our records hold it. One hue, darker where it is more common; hover a country for its figure.
- United States (measured from records)
- #947 (measured from records)
- 3 (measured from records)
- Record sources
- 441 (measured from records)
- ≈1 in 1.6K (inferred from the name graph)
77,923 people, 2010
of 19M surnames, spellings grouped
recorded for this name
corpus datasets behind its best-documented spelling
strongest: highest-authority source
Ireland, est.
measured from records inferred from the name graph
Oconnor in other scripts: Thai and Korean (Hangul)
(measured from records)One other spelling is counted as the same name:
Locally spelled O'Connor in AU Australia, IE Ireland, NZ New Zealand.
Spellings marked ● are how people bearing the name write it in our records, and ○ marks a model's transliteration; click a spelling to open its page.
Meaning & origin
No verified etymology recorded for this name yet — the entries below are drawn from usage statistics and the name graph.
Where the surname Oconnor is found
(measured from records)Oconnor counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.
Sorted by bearers: national registers' counts, and Mondonomo's estimates (≈, est.) where no register counts.
| Country | Most common spelling | Sources | ||||
|---|---|---|---|---|---|---|
| US United States | #310 | 77,923 | 1 in 4.3K | 78K | Oconnor | 441 |
| GB United Kingdom | #190 | ≈20,000 est. | ≈1 in 3.4K | 30K | Oconnor | 241 |
| AU Australia | #133 | ≈10,000 est. | ≈1 in 2.7K | — | O'Connor | 178 |
| CA Canada | #277 | ≈8,300 est. | ≈1 in 5K | — | Oconnor | 173 |
| IE Ireland | #14 | ≈3,500 est. | ≈1 in 1.6K | — | O'Connor | 141 |
| NZ New Zealand | #153 | ≈1,200 est. | ≈1 in 4.3K | — | O'Connor | 93 |
77,923 people counted by Census Bureau — Surname Frequency 2010, 2010. Exact figures are national registers' own counts, while figures marked ≈ and est. are Mondonomo’s estimates, counted from our sources and calibrated against those registers; hover one for how far to trust it in that country. A dash means neither exists.
Registers cited: Census Bureau — Surname Frequency 2010; Surnames of England and Wales (taliesin-arlein.net, Sept 2002 electoral register). Figures without a register are Mondonomo estimates; see Methodology.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table (how that works).
How to address them
(machine-generated)Evidence
(measured from records)24 registers and reference works attest this spelling, across 15 countries.
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- Which countries have the most people with the surname Oconnor?
- In the United States, the national register counted about 78 thousand people named Oconnor, more than in any other country we hold, where it is most often spelled oconnor. After it come United Kingdom, Australia, Canada and Ireland; the country table on this page ranks them.
- How common is the name Oconnor?
- In the United States, the national register counted 77,923 people named Oconnor in 2010, about 1 in 4.3 thousand residents.
- How common is Oconnor compared with other names?
- In the United States, Oconnor is the 310th most common surname of 6,282,806 surnames recorded there.
What do you want to know about Oconnor?
Nobody replies to these one by one, but what readers ask decides what these pages answer next.
Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/oconnorThe payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. It takes a free API key (1,000 requests a day), which returns what this page shows everyone; the full country table, every register citation and the year-by-year series come with a licensed key, as does bulk access.
About this data
measured from records inferred from the name graph machine-generated
These figures come from the data snapshot of and will change as it is rebuilt.
Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.
Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.
Cite this page Mondonomo, “Oconnor” — ranked 385th in the United States (Census Bureau, 2010). Data snapshot 2026-10-13.