Explore the Family Name Mountcastle

The meaning of Mountcastle

1. Irish: adopted for Ó Maolchaisil, see Cashell. This surname is rare in Ireland. 2. English (Lincolnshire and Lancashire): variant of Muncaster. History: A family of this name (see 1 above) was associated with Ballymulcashell in Clare. A registrar in Munster changed the name to Mountcashel around 1840.

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

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

The surname Mountcastle, based on data from the Decennial U.S. Census, showed a minor increase in popularity between 2000 and 2010. It rose slightly in rank from 36,463 in 2000 to 36,154 in 2010, representing a change of 0.85%. The total count of people with the Mountcastle surname also increased during this period from 579 to 620, marking a growth of 7.08%. However, the proportion per 100,000 remained constant at 0.21.

	2000	2010	Change
Rank	#36,463	#36,154	0.85%
Count	579	620	7.08%
Proportion per 100k	0.21	0.21	0%

Race and Ethnicity of people with the last name Mountcastle

When examining the ethnic identity associated with the Mountcastle surname, data from the Decennial U.S. Census shows a few shifts between 2000 and 2010. The majority identifying as White decreased slightly from 88.08% to 86.77%, while those identifying as Hispanic saw a significant increase of 86.78%, though still only represented 2.26% of the total in 2010. The Black community saw a small decrease from 7.94% to 7.74%. Those identifying with two or more races decreased from 1.9% to 1.61%. There was no recorded change for Asian/Pacific Islander or American Indian and Alaskan Native identities.

	2000	2010	Change
White	88.08%	86.77%	-1.49%
Black	7.94%	7.74%	-2.52%
Hispanic	1.21%	2.26%	86.78%
Two or More Races	1.9%	1.61%	-15.26%
Asian/Pacific Islander	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%