McIlhenny
McIlhenny or McElhenny is an Irish surname commonly found in Donegal and Derry. They are a Sept of the Cenel Eogain race, son of Niall high king of Ireland. In Gaelic the name translates "servant of Saint Canice". Notable people with the surname include:
- Alexander McIlhenny, American military officer, farmer, and diarist
- Bernice McIlhenny Wintersteen, American art collector, president of the Philadelphia Museum of Art
- Don McIlhenny, American football player
- Edmund McIlhenny, American businessman and inventor of Tabasco sauce
- Edward Avery McIlhenny, American businessman and Arctic explorer
- Henry Plumer McIlhenny, American art collector
- John Avery McIlhenny, American businessman, Rough Rider, and politician
- Paul C. P. McIlhenny, American businessman and conservationist
- Walter Stauffer McIlhenny, American businessman and World War II Marine
McElhenny
- Hugh McElhenny, American football player
- Marcus McElhenney, American attorney, Olympic rowing coxswain
- Rob McElhenny, American actor and writer best known for ''It's Always Sunny in Philadelphia''