# Riordan (surname)

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

A surname.

| Field | Value |
|---|---|
| Origin | not recorded |
| Type | not recorded |
| People in the US (2010 Census) | 7,848 |
| US rank (2010) | 4,515 of 162,253 |
| How often | about 1 in every 39,341 people |
| Change since 2000 | +6.1% (7,394 in 2000) |
| Pronunciation | not recorded |
| Variant spellings | none recorded |

## Who carries it

Share of people named Riordan 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) | 95% |
| Black (not Hispanic) | 0.7% |
| Hispanic or Latino (any race) | 2.1% |
| Asian and Pacific Islander | 0.9% |
| American Indian and Alaska Native | 0.2% |
| Two or more races | 1.3% |

## Where

Wikidata records people named Riordan in the United States and Spain.

## People named Riordan

- Rick Riordan, American author (born 1964)
- Mike Riordan, American basketball player
- Richard Riordan, American businessman and politician
- Fergus Riordan, British actor

## Similar surnames

Reardon, Rardin.

## 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.