Historian Harry Shave gives two versions of the name’s origin.
Named for Victor Christian William Cavendish, Ninth Duke of Devonshire (1868-1938), who served as Governor General of Canada from 1916 to 1921.
Other Winnipeg street commemorating Governors General include Aberdeen Avenue, Athlone Drive, Byng Place, Dufferin Avenue, Grey Street, Lansdowne Avenue, Leger Crescent, Lisgar Avenue, Lorne Avenue, Minto Street, Monck Avenue, Stanley Street, Tweedsmuir Road, Vanier Drive, and Vincent Massey Boulevard.
See also Carlton, Edmonton, Ellice, Garry, Qu’Appelle, York. The basis for this conclusion is unclear, as Fraser, who homesteaded near Manitou, appeared not to have a connection with Winnipeg warranting commemoration.
Named for the Hudson’s Bay Company trading post Fort Garry which, in turn, was named for Nicholas Garry (c1782-1856), a director of the company.
Interestingly, several towns in Manitoba have main streets named Broadway.