The name "Mesnil" comes from Latin: mansionilis meaning "little estate". The name "Le Mesnil-le-Roi" could be said "The King's small estate" (Francis I). On the other hand, the name of Mesnil-le-Roi in the time of the French Revolution was Le Mesnil-Carrières, "Mesnil quarries".
The inhabitants are called Mesnilois (male) and Mesniloise (female).
The arms of Le Mesnil-le-Roi are blazoned : Azure, two spurs fesswise lower one contourny undersole straps one against the other intertwined in pale rowelled and buckled Or, and on a chief argent a salamander gules between two fleur-de-lis Or.
This coat of arms, adopted in 1952, derives from the La Salle family, the ancient landowners of Carrières-sous-Bois, and it was given to them by Francis I.
The Orangery of the Château du Mesnil, situated in a protected zone of POS ND-EBC (Non-cultivable woodland)) which has been converted to 43 private houses
Old abandoned mineshafts (Château du Mesnil, now demolished), situated on the edge of the Orangery on the Rue de Général Leclerc
Artificial caves (abandoned), ancient glaciers (abandoned) and ruins of canals (now abandoned) in the communal woodlands (Château du Mesnil, now demolished).
Émile Littré, bought a house in Mesnil-le-Roi, which he styled "Ménil-le-Roi," in 1847, and stayed there until his death in 1881; it was here that he did the bulk of his work on his great Dictionnaire de la langue française (1872; supplement 1877)[5]
Jacques Fath, tailor, born in Mesnil-le-Roi in 1912
Serge Gainsbourg, until then Lucien Ginsburg, married Élisabeth Levitsky at Mesnil-le-Roi Town Hall on 3 November 1951. He worked at this time at the Maison Champsfleur (actually an old people's home) as an assistant to young Israeli children whose parents were victims of the Holocaust.
^Nicole Savy, Le Siècle des dictionnaires (Paris: Ministère de la Culture et de la Communication/Éditions de la Réunion des Musées Nationaux, 1987), p. 23.
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