Explore the Family Name O’mahony
The meaning of O’mahony
Irish: Anglicized form of Gaelic Ó Mathghamhna ‘descendant of Mathghamhain’ (see Mahoney). There are two families of this name, in Cork and Ulster, but the Ulster surname was usually Anglicized as McMahon. Some characteristic forenames: Irish Conor, Aisling, Brendan, Ciaran, Eoin, Ronan, Siobhan.
Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.
How common is the last name O’mahony in the United States?
Based on the Decennial U.S. Census, the popularity of the surname O'Mahony has significantly increased over a decade. In 2000, O'Mahony was ranked 38,771st most common surname and by 2010, it jumped to position 31,656 - an impressive change of 18.35%. Similarly, the count increased from 536 to 730 representing a 36.19% rise over the ten years. The proportion of the surname O'Mahony per 100,000 people also experienced a 25% growth from 0.2 in 2000 to 0.25 in 2010.
| 2000 | 2010 | Change | |
|---|---|---|---|
| Rank | #38,771 | #31,656 | 18.35% |
| Count | 536 | 730 | 36.19% |
| Proportion per 100k | 0.2 | 0.25 | 25% |
Race and Ethnicity of people with the last name O’mahony
The Decennial U.S. Census also provides insightful data about the ethnic identity associated with the O'Mahony surname. In both 2000 and 2010, there were no recorded instances of the O'Mahony surname among Asian/Pacific Islanders, Blacks, and American Indian and Alaskan Natives. The majority of individuals with the O'Mahony surname identified as White, although this figure decreased slightly from 95.52% in 2000 to 94.25% in 2010. There was a notable increase in the percentage of the O'Mahony surname amongst the Hispanic ethnicity, which rose substantially by 209.68% from 0.93% in 2000 to 2.88% in 2010. Lastly, those who identified with two or more races saw a decline in the use of the surname, dropping by 20.99% from 2.43% in 2000 to 1.92% in 2010.
| 2000 | 2010 | Change | |
|---|---|---|---|
| White | 95.52% | 94.25% | -1.33% |
| Hispanic | 0.93% | 2.88% | 209.68% |
| Two or More Races | 2.43% | 1.92% | -20.99% |
| Asian/Pacific Islander | 0% | 0% | 0% |
| Black | 0% | 0% | 0% |
| American Indian and Alaskan Native | 0% | 0% | 0% |