His father was William Grigsby McCormick (1851–1941), whose father William Sanderson McCormick (1815–1865) was one of the founders of McCormick Harvester, which merged in 1902 with the Deering Harvester Company founded by William Deering and others to form International Harvester Corporation.
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 | 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 | William Wilberforce | William James | William Makepeace Thackeray | Fort William | William Hanna | William Hague | William III | William Hurt | William Walton |
In Chicago Cyrus, Leander and their brother William founded what became the McCormick Harvesting Machine Company and eventually International Harvester.