Named after the rue Marx-Dormoy, which honours Marx Dormoy (1888–1941).
The station opened in 1916 as Torcy, after the rue de Torcy, which honours the marquis de Torcy, Colbert's nephew. Station and street took Dormoy's name together on 11 May 1946, according to one source; the City's register dates the street's renaming to July 1945. Dormoy, a former socialist interior minister, was killed in Montélimar in 1941 by former members of the far-right Cagoule.