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:
Bernice McIlhenny Wintersteen (1903–1986), American art collector, president of the Philadelphia Museum of Art (1964–1968) Don McIlhenny (born 1934), American football player Edmund McIlhenny (1815–1890), American businessman and inventor of Tabasco sauce Edward Avery McIlhenny (1872–1949), American businessman and Arctic explorer Henry Plumer McIlhenny (1919–1986), American art collector John Avery McIlhenny (1867–1942), American businessman, Rough Rider, and politician Paul C. P. McIlhenny (1944–2013), American businessman and conservationist Walter Stauffer McIlhenny (1910–1985), American businessman and World War II Marine
McElhenny
Hugh McElhenny (1928–2022), American football player
Rob McElhenny (1977–present), American actor and writer best known for It's Always Sunny in Philadelphia