Explore the Family Name Kilduff

The meaning of Kilduff

Irish (Westmeath and Roscommon): Anglicized form of Gaelic Mac Giolla Duibh ‘son of Giolla Dubh’, ‘the black-haired lad’, from dubh ‘dark, black-haired’. Some characteristic forenames: Irish Kieran, Liam.

Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.

How common is the last name Kilduff in the United States?

The surname Kilduff saw an increase in popularity from 2000 to 2010 according to the Decennial U.S. Census data. In 2000, it was ranked as the 20,152nd most common surname, but by 2010, it had risen to the 20,029th spot, marking an increase of 0.61 percent. The count of individuals with the Kilduff surname also grew during this period from 1230 to 1336, indicating an 8.62 percent increase. However, when normalized for population growth, the proportion per 100,000 people slightly dropped by 2.17 percent, from 0.46 to 0.45.

	2000	2010	Change
Rank	#20,152	#20,029	0.61%
Count	1,230	1,336	8.62%
Proportion per 100k	0.46	0.45	-2.17%

Race and Ethnicity of people with the last name Kilduff

In terms of ethnic identity, the majority of individuals with the Kilduff surname identified as White in both 2000 and 2010, with percentages remaining nearly static at 97.07 and 97.01 respectively, showing a marginal decrease of 0.06 percent based on the Decennial U.S. Census. The Asian/Pacific Islander representation reduced by 8.77 percent, while those reporting two or more races declined by 29.25 percent. The Hispanic community saw a significant rise, increasing their representation by 60.20 percent. There were no individuals who identified as Black, American Indian, or Alaskan Native in either census year.

	2000	2010	Change
White	97.07%	97.01%	-0.06%
Hispanic	0.98%	1.57%	60.2%
Two or More Races	1.06%	0.75%	-29.25%
Asian/Pacific Islander	0.57%	0.52%	-8.77%
Black	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%