Explore the Family Name Guilfoyle

The meaning of Guilfoyle

Irish (Tipperary, Laois and Kilkenny): shortened Anglicized form of Gaelic Mac Giolla Phóil, a patronymic from the personal name Giolla Phóil ‘servant of (Saint) Paul’.

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

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

Based on the Decennial U.S. Census data, the surname Guilfoyle has seen a slight change in popularity between 2000 and 2010. The rank of this surname shifted from 16,411 to 16,427, indicating a tiny decrease of 0.1%. However, the count, or the number of people bearing the Guilfoyle surname, increased by approximately 8.42%, growing from 1,615 to 1,751 during the same period. Importantly, this growth did not significantly impact the proportion of this surname per 100k population, which saw a minor decrease of -1.67%.

	2000	2010	Change
Rank	#16,411	#16,427	-0.1%
Count	1,615	1,751	8.42%
Proportion per 100k	0.6	0.59	-1.67%

Race and Ethnicity of people with the last name Guilfoyle

Regarding ethnicity, the Decennial U.S. Census data reveals some interesting shifts over the years 2000 to 2010. The largest percentage of those with the Guilfoyle surname identified as White, although this group decreased slightly from 95.36% to 92.23%. Meanwhile, individuals who identify as Hispanic have more than doubled, increasing from 1.61% to 3.31%. The Asian/Pacific Islander category also saw growth, moving up from 0.68% to 1.03%. Additionally, there was an increase amongst those identifying as two or more races, from 1.86% to 2.74%. However, there were no individuals with the Guilfoyle surname who identified as Black or American Indian and Alaskan Native in either year.

	2000	2010	Change
White	95.36%	92.23%	-3.28%
Hispanic	1.61%	3.31%	105.59%
Two or More Races	1.86%	2.74%	47.31%
Asian/Pacific Islander	0.68%	1.03%	51.47%
Black	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%