as a Last Name
- 11,768
- people in the U.S. have this name View all people named Oreilly
Meaning & Origins
Irish: Anglicized form of Gaelic Ó Raghailligh ‘descendant of Raghailleach’, Old Irish Roghallach, a personal name of unexplained etymology. This is the name of a chieftain family in County Cavan, related to the O’Rourkes.
| 2,632nd in the U.S. for 2011 |
Nicknames & variations
Quick facts
- Thousands
- of people in the U.S have this name
- 11,768
- to be exact (as of February 2011)
- Massachusetts
- has the most people named Oreilly per capita
Top state populations
U.S. Distribution Map
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