MacDonaldism · noun1
From MacDonald + -ism after Ramsay MacDonald, founder of the British Labour Party.
Macdonaldism · noun2
From Macdonald + -ism, from Donald Stovel Macdonald, the chair of the Royal Commission on the Economic Union and Development Prospects for Canada (the Macdonald Commission).
Etymology from Wiktionary, CC BY-SA 4.0.