Explore the Family Name Killough

The meaning of Killough

Irish (Antrim) and Scottish (Glasgow): probably a northern Irish variant of Scottish Killoch, a habitational name from the village of Killoch in Ayrshire.

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

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

Based on the Decennial U.S. Census data, the surname Killough experienced a slight decrease in popularity between 2000 and 2010. The name dropped in rank from 11,032 in 2000 to 11,810 in 2010, a change of -7.05 percent. Despite this drop in rank, the actual count of individuals with this surname increased marginally by 0.23 percent, from 2,644 to 2,650. Consequently, the proportion of people with the surname per 100,000 also decreased by 8.16 percent over the decade.

	2000	2010	Change
Rank	#11,032	#11,810	-7.05%
Count	2,644	2,650	0.23%
Proportion per 100k	0.98	0.9	-8.16%

Race and Ethnicity of people with the last name Killough

The ethnicity associated with the Killough surname also had notable shifts in the same period according to the Decennial U.S. Census data. The most significant change was seen within the Hispanic group, which experienced an increase of 143.36 percent. Meanwhile, there was a considerable decline in people of Asian/Pacific Islander origin who bear the Killough surname, with a decrease of 33.33 percent. White individuals, who were the dominant ethnicity for this surname, experienced a minor decrease of 1.20 percent. There was an increase in individuals identifying as having two or more ethnic identities by 10.78 percent, while those of Black ethnicity saw a decrease of 24.84 percent. Finally, individuals identifying as American Indian and Alaskan Native also saw an increase of 54.10 percent.

	2000	2010	Change
White	93.61%	92.49%	-1.2%
Hispanic	1.13%	2.75%	143.36%
Black	3.06%	2.3%	-24.84%
Two or More Races	1.02%	1.13%	10.78%
American Indian and Alaskan Native	0.61%	0.94%	54.1%
Asian/Pacific Islander	0.57%	0.38%	-33.33%