The specific epithet honours Sir William Macarthur (1800–1882), horticulturalist, botanist and vigneron in New South Wales, who did much to establish an Australian wine industry.
Erythrina × bidwillii is the scientific name for two different cultivars produced from hybridising Erythrina species at Camden Park Estate, New South Wales, Australia, in the early 1840s by William Macarthur, one of the most active and influential horticulturists in Australia.
William Shakespeare | William Laud | Douglas MacArthur | 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 MacArthur, was the first President of the Society, having learned Irish in Cloch Cheannfhaolaidh in west Donegal.