Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
MANSEL
As described in historical dictionaries
Patronymica Britannica (1860)
MANSEL. "The Mansels inhabited Le Mans in France, and came over with William the Conqueror." Taylor's Roman de Roil. Talbot's Eng. Etym. But see Mansell and Maunsell.