Explore the Family Name O’fallon

The meaning of O’fallon

Irish (Leinster and Connacht): Anglicized form of Gaelic Ó Fallamhain ‘descendant of Fallamhan’ (see Fallon). Some characteristic forenames: Irish Liam.

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

How common is the last name O’fallon in the United States?

Based on the Decennial U.S. Census data, the surname O’Fallon has seen an increase in popularity between 2000 and 2010. In the year 2000, O’Fallon was ranked as the 41,859th most common surname, but by 2010 it had moved up to the 39,164th spot, reflecting a 6.44 percent increase in rank. The number of individuals with this surname also grew from 489 in 2000 to 562 in 2010, marking a 14.93 percent increase. Its proportion per 100,000 people increased slightly from 0.18 in 2000 to 0.19 in 2010, suggesting a growing prevalence of this name in the population.

	2000	2010	Change
Rank	#41,859	#39,164	6.44%
Count	489	562	14.93%
Proportion per 100k	0.18	0.19	5.56%

Race and Ethnicity of people with the last name O’fallon

The ethnicity associated with the O’Fallon surname is predominantly White, according to the Decennial U.S. Census data. In both 2000 and 2010, over 96 percent of O'Fallons identified as White, with a negligible decrease of 0.02 percent over the decade. Meanwhile, the percentage of O'Fallons identifying as Hispanic dropped significantly from 2.45 percent in 2000 to 1.60 percent in 2010 - a 34.69 percent change. Interestingly, the census data for 2010 also recorded a small percentage (0.89) of O'Fallons identifying with two or more races, a category that wasn't represented in the 2000 data. No O’Fallons identified as Asian/Pacific Islander, Black, or American Indian and Alaskan Native in either year.

	2000	2010	Change
White	96.11%	96.09%	-0.02%
Hispanic	2.45%	1.6%	-34.69%
Two or More Races	0%	0.89%	0%
Asian/Pacific Islander	0%	0%	0%
Black	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%