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O'Connor
Meaning: Descendant of Conchobhar (lover of hounds / heroic warrior)
Ancestral homeland: Irish (Europe (Western & Northern)). Starting letter: O.
The surname "O'Connor" is of Irish origin, meaning "Descendant of Conchobhar (lover of hounds / heroic warrior)". In the United States, it ranks #889 in frequency with an estimated 6,037 individuals, predominantly living in Massachusetts, New York, Pennsylvania. Historically, One of the most illustrious royal dynasties of ancient Ireland.
Historical Roots & Etymology
One of the most illustrious royal dynasties of ancient Ireland. The High Kings of Ireland, including RuaidrĂ Ua Conchobair (last undisputed High King before the Norman invasion), belonged to this clan.
As an Occupational surname, the patronymic or occupational title reflects cultural traditions preserved across centuries. Ancient parish registers, civil census returns, and municipal tax rolls document early branches of the O'Connor family adapting their spelling and pronunciation across migrations.
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How Common is the Surname O'Connor in the US?
#889
Top US Surnames6,037
American residents18.1
per 1 Million people+14.2%
US Census cycleTop US States by O'Connor Population Density % of all US bearers
American Immigration Manifests & Ports of Arrival
Immigration records at the National Archives and Records Administration (NARA) trace primary waves of O'Connor families arriving in the United States during the 1880–1924 (Great Migration Era).
Global Geographic Distribution & Diaspora
Historical records trace prominent lineages of the O'Connor family across these major worldwide regions:
Notable Historical Figures & Bearers of "O'Connor"
Celebrated individuals carrying the surname O'Connor with distinction across civic governance, literature, science, and industry:
Historical Spelling Variants
Before standardized spelling conventions in the 19th century, civil census enumerators recorded multiple phonetically related variants:
Frequently Asked Questions about O'Connor
Expert answers to common questions about names, origins, and naming traditions
The surname O'Connor originates from Irish heritage and traditionally translates to "Descendant of Conchobhar (lover of hounds / heroic warrior)". Historically, it was adopted as an occupational marker to signify clan lineage, professional craft, or geographic homeland.
According to United States Census Bureau records, O'Connor ranks as the #889 most common surname in America, carried by an estimated 6,037 people (18.1 occurrences per million residents). The highest concentrations are found in Massachusetts (22%), New York (19.5%), Pennsylvania (14.2%), Illinois (11.8%), California (9.5%).
Major waves of families carrying the name O'Connor arrived in North America during the 1880–1924 (Great Migration Era). The primary historical ports of entry recorded in immigration manifests include Port of New York (Ellis Island), Boston, Philadelphia.
Notable individuals with the surname O'Connor include Sinéad O’Connor (Singer), Flannery O’Connor (Novelist), Sandra Day O’Connor (First Female US Supreme Court Justice), recognized for their contributions in history, governance, arts, and science.
Recorded historical spelling variations and regional cognates of O'Connor include Connor, Connors, O’Conor.
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Surname Fast Facts
- Origin / Demonym
- Irish
- Ancestral Nation
- đŸ‡®đŸ‡ª Irish
- Classification
- Occupational
- US Frequency Rank
- #889
- Est. US Population
- ~6,037
- Primary US State
- Massachusetts
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