Maddenstown House was home to Captain William Kelly, horse racing enthusiast and patron of prize fighter Dan Donnelly.
He was associated numerous principal men of the Plymouth Brethren movement including William Kelly, J.G. Bellett, John Nelson Darby, George Wigram.
William McDonough Kelly (born 1925), political strategist and retired Canadian Senator
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William Moore Kelly (1827–1888), businessman and politician in New Brunswick
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Kenneth Kelly (1905–1984), nicknamed "Bill", American football player and coach, head coach at Central Michigan University, 1951–1966
William Shakespeare | William Laud | William Blake | William | William III of England | William Morris | William McKinley | William Howard Taft | William Ewart Gladstone | William the Conqueror | William S. Burroughs | Kelly Clarkson | William Shatner | William Faulkner | William Randolph Hearst | William Wordsworth | William Tecumseh Sherman | William Hogarth | Prince William, Duke of Cambridge | William Penn | William Jennings Bryan | William Gibson | R. Kelly | William Wilberforce | William James | William Makepeace Thackeray | Paul Kelly | Fort William | William Hanna | William Hague |
In 1861 Ward and Zoheth S. Durfee of New Bedford, Massachusetts, obtained control of the patents of William Kelly, credited in Europe to Henry Bessemer.
According to the legend, in 1887 four brothers in Dryden, Texas—Frank, Jim, John, and Lee Reagan—hired an illiterate Seminole man named William Kelly to help with work on their ranch.