# Kilduff (surname)

Source: https://namelineage.com/surname/kilduff/  
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) | 1,336 |
| US rank (2010) | 20,029 of 162,253 |
| How often | about 1 in every 231,097 people |
| Change since 2000 | +8.6% (1,230 in 2000) |
| Pronunciation | not recorded |
| Variant spellings | Kildow |

## Etymology

Reduced Anglicized form of Irish Mac Giolla Duibh (“son of the black-haired lad”), from giolla (“boy, lad”) and dubh (“black”).

## Who carries it

Share of people named Kilduff 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% |
| Hispanic or Latino (any race) | 1.6% |
| Asian and Pacific Islander | 0.5% |
| Two or more races | 0.8% |

## 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.