# Monahan (surname)

Source: https://namelineage.com/surname/monahan/  
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.

| Field | Value |
|---|---|
| Origin | Irish |
| Type | not recorded |
| People in the US (2010 Census) | 15,533 |
| US rank (2010) | 2,347 of 162,253 |
| How often | about 1 in every 19,877 people |
| Change since 2000 | +3.2% (15,058 in 2000) |
| Pronunciation | not recorded |
| Variant spellings | none recorded |

## Etymology

An anglicization of Irish Ó Manacháin, commonly anglicized as Monaghan.

## Who carries it

Share of people named Monahan 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) | 94% |
| Black (not Hispanic) | 0.7% |
| Hispanic or Latino (any race) | 2.6% |
| Asian and Pacific Islander | 0.8% |
| American Indian and Alaska Native | 0.3% |
| Two or more races | 1.2% |

## Where

Wikidata records people named Monahan in the United States.

## People named Monahan

- William Monahan, American screenwriter and novelist
- Patrick Monahan, American vocalist
- Dan Monahan, American actor
- Fintan Monahan, bishop of Killaloe
- David Monahan, American actor

## Similar surnames

Moynihan, Mooneyhan, Monnin, Manion, Mannino, Mannion, Menon, Momin, Mooneyham, Manahan, Mannon, Memon.

## 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.