Explore the Family Name Castonguay

The meaning of Castonguay

French Canadian: variant of Gastonguay, which is a combination of the first and last names of the first bearer of this surname in Canada, Gaston Guay. Some characteristic forenames: French Pierre, Lucien, Marcel, Normand, Alban, Andre, Armand, Camille, Adelard, Alcide, Alyre, Aurele.

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

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

Based on data from the Decennial U.S. Census, the popularity of the surname Castonguay witnessed a slight drop between 2000 and 2010. In 2000, it ranked 13,675th in terms of prevalence, but decreased to hold the 14,257th position in 2010 – a 4.26% change. However, the total count of individuals bearing this surname increased by 3.34% from 2,034 in 2000 to 2,102 in 2010. The proportion per 100,000 people also declined from 0.75 to 0.71, reflecting a 5.33% decrease.

	2000	2010	Change
Rank	#13,675	#14,257	-4.26%
Count	2,034	2,102	3.34%
Proportion per 100k	0.75	0.71	-5.33%

Race and Ethnicity of people with the last name Castonguay

Turning our attention to ethnic identity, the Decennial U.S. Census data reveals some changes between 2000 and 2010 among those with the surname Castonguay. The majority of these individuals identify as White, with 96.95% in 2000 and slightly less, 96.43%, in 2010. Notably, there was a significant increase of 70.31% in those identifying as Hispanic and a 60.20% rise in those recognizing themselves as part of two or more races. On the other hand, individuals identifying as Black or American Indian and Alaskan Native were not represented in the 2010 data. The percentage of those identifying as Asian/Pacific Islander also marginally fell from 0.59% to 0.57%.

	2000	2010	Change
White	96.95%	96.43%	-0.54%
Two or More Races	0.98%	1.57%	60.2%
Hispanic	0.64%	1.09%	70.31%
Asian/Pacific Islander	0.59%	0.57%	-3.39%
Black	0.29%	0%	0%
American Indian and Alaskan Native	0.54%	0%	0%