# O'Reilly (surname)

Source: https://namelineage.com/surname/oreilly/  
Publisher: Name Lineage. Counts from the US Census Bureau; origin and etymology from Wiktionary; bearers from Wikidata. Data updated 2026-11-11.

A surname from Irish [in turn originating as a patronymic] from Reilly.

| Field | Value |
|---|---|
| Origin | Irish |
| Type | patronymic, formed from a father’s (or ancestor’s) given name |
| People in the US (2010 Census) | 12,074 |
| US rank (2010) | 2,970 of 162,253 |
| How often | about 1 in every 25,571 people |
| Change since 2000 | +7.6% (11,224 in 2000) |
| Pronunciation | /əˈɹaɪli/, 3 syllables |
| Variant spellings | none recorded |

## Who carries it

Share of people named O'Reilly in the 2010 US Census by the Census's own race and ethnicity groups. The Census suppresses a share when the count behind it is small.

| Group | Share |
|---|---|
| White (not Hispanic) | 92% |
| Black (not Hispanic) | 2.0% |
| Hispanic or Latino (any race) | 3.5% |
| Asian and Pacific Islander | 0.7% |
| American Indian and Alaska Native | 0.3% |
| Two or more races | 1.5% |

## Where

Wikidata records people named O'Reilly in the United States and Australia.

## People named O'Reilly

- Bill O'Reilly, American political commentator, television host and writer
- Heather O'Reilly, American soccer player
- Ahna O'Reilly, actress
- Mary Margaret O'Reilly, assistant treasurer of the United States Bureau of the Mint
- Bill O'Reilly, Australian cricketer (1905-1992)
- Leonora O'Reilly, American activist
- Robert O'Reilly, American actor
- Cyril O'Reilly, American actor

## Similar surnames

Orrell, O'Riley, Orihuela.

## How to read these numbers

A Census count is people alive and counted in 2010, not births, and names occurring fewer than 100 times are not published at all. Ethnicity shares are the Census's own categories.