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 (1778–1835), American military officer, farmer, and diarist
• 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

• Hugh McElhenny (1928–2022), American football player
• Marcus McElhenney (b. 1981), American attorney, Olympic rowing coxswain
• Rob McElhenny (1977–present), American actor and writer best known for It's Always Sunny in Philadelphia

• Josiah McElheny (born 1966), American artist
• Victor McElheny (born 1935), American science writer

• McElhenney
• McElhinney

Surname list

This page lists people with the surname McIlhenny.
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