as a Last Name
- 9,080
- people in the U.S. have this name View all people named Hennessy
Meaning & Origins
Irish: reduced form of O’Hennessy, an Anglicized form of Gaelic Ó hAonghusa ‘descendant of Aonghus’ (see Angus, and compare McGinnis).
| 3,397th in the U.S. for 2011 |
Nicknames & variations
Quick facts
- Thousands
- of people in the U.S have this name
- 9,080
- to be exact (as of February 2011)
- Massachusetts
- has the most people named Hennessy per capita
Top state populations
U.S. Distribution Map
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