Duke of Estouteville (duc d'Estouteville) was a title in the French nobility that is claimed today by the Prince of Monaco.
Estouteville was inherited by the last duke's sister, Marie d'Orleans-Longueville, Duchess de Nemours (1625–1707) whose closest relatives were remote cousins descended through daughters of the Longueville.
Primogeniture heir would have been the Duchess of Retz, but she was one step further genealogically even if she descended from Éléonore's older sister.
[dubious – discuss] Éléonore's descendant Jacques François Léonor Goyon de Matignon (1689–1751), count of Thorigny and lord of the duchy of Estouteville, married in 1715 Louise Hippolyte, heiress-presumptive to the Principality of Monaco, and adopted the name Grimaldi.
The legitimate succession of Estouteville passed in theory to the Urach descendants of Florestine of Monaco, and is currently held by Patrick Guinness.