Explore the Family Name Underdahl

The meaning of Underdahl

Norwegian: habitational name from any of several farmsteads with similar names (for example Undredal in Sogn), which are probably derived from Old Norse undir ‘under’ + dalr ‘valley’, denoting a farm situated in a valley bottom. Some characteristic forenames: German Hans, Orlo.

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

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

Based on the Decennial U.S. Census data, the popularity of the surname Underdahl has seen a slight decrease between 2000 and 2010. In 2000, Underdahl was ranked as the 33,054th most popular surname in the United States, with a count of 653 individuals carrying this name. By 2010, though the count dropped by just over 1% to 646, its rank slipped further to 34,916. The proportion per 100,000 people also fell by 8.33%, from 0.24 in 2000 to 0.22 in 2010.

	2000	2010	Change
Rank	#33,054	#34,916	-5.63%
Count	653	646	-1.07%
Proportion per 100k	0.24	0.22	-8.33%

Race and Ethnicity of people with the last name Underdahl

The ethnicity distribution for the surname Underdahl, according to the Decennial U.S. Census, has stayed relatively consistent from 2000 to 2010, with a notable majority of those holding this surname identifying as White. In 2000, an overwhelming 98.62% of individuals with this surname identified as White, while by 2010, this number had slightly decreased to 97.06%. There was no recorded ethnicity data for those identifying as Asian/Pacific Islander, Black, or American Indian and Alaskan Native during either census year. However, there was a new emergence of Hispanic identity within this surname group from 0% in 2000 to 1.86% in 2010.

	2000	2010	Change
White	98.62%	97.06%	-1.58%
Hispanic	0%	1.86%	0%
Asian/Pacific Islander	0%	0%	0%
Two or More Races	0.77%	0%	0%
Black	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%