# Diffley (surname)

Source: https://namelineage.com/surname/diffley/  
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 | patronymic, formed from a father’s (or ancestor’s) given name |
| People in the US (2010 Census) | 554 |
| US rank (2010) | 39,659 of 162,253 |
| How often | about 1 in every 557,302 people |
| Change since 2000 | +9.5% (506 in 2000) |
| Pronunciation | not recorded |
| Variant spellings | none recorded |

## Etymology

Reduced Anglicized form of Irish Ó Duibhghiolla (“descendant of Duibhgiolla”), a personal name composed of the elements dubh (“black”) and giolla (“lad”).

## Who carries it

Share of people named Diffley 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) | 97% |
| Black (not Hispanic) | 0.0% |
| Hispanic or Latino (any race) | 1.8% |
| American Indian and Alaska Native | 0.0% |

## Similar surnames

Dively, Davila, Duvall, Duval, Dibble, Deville, Dipaolo, DePaul, DiPaola, Devall, Dubiel, Dippel.

## 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.