Annam was a name for Vietnam used until 1945. Its usage varies depending on the time period and context.Đại Việt, Việt Nam, Đại Nam – official names of the country at different times Annam, a subdivision of French Indochina, used as an exonym; now the central region of Vietnam Annan, the southernmost province of Imperial China between 679–866, now northern Vietnam Annamite Range, a mountain range in Laos and Vietnam