# Castor (surname)

Source: https://namelineage.com/surname/castor/  
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 | Greek |
| Type | not recorded |
| People in the US (2010 Census) | 6,063 |
| US rank (2010) | 5,722 of 162,253 |
| How often | about 1 in every 50,923 people |
| Change since 2000 | +14% (5,331 in 2000) |
| Pronunciation | /ˈkæs.tɚ/, 2 syllables |
| Variant spellings | none recorded |

## Etymology

From Ancient Greek Κάστωρ (Kástōr), from Ancient Greek κάστωρ (kástōr, “beaver”).

## Who carries it

Share of people named Castor 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) | 61% |
| Black (not Hispanic) | 11% |
| Hispanic or Latino (any race) | 21% |
| Asian and Pacific Islander | 4.7% |
| American Indian and Alaska Native | 0.4% |
| Two or more races | 1.8% |

## Where

Wikidata records people named Castor in the United States.

## People named Castor

- Kathy Castor, American lawyer & politician (born 1966)
- Jimmy Castor, American musician (1940–2012)
- Bruce Castor, American lawyer and politician
- Annie Glenn, American advocate (1920-2020)

## Similar surnames

Castro, Caster, Castrejon, Castorena, Castruita, Casterline, Cacciatore, Castrellon, Castrillon, Castrillo, Chester, Custer.

## 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.