Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
GURDON
As described in historical dictionaries
Patronymica Britannica (1860)
GURDON. "This family came into England with the Conqueror, from Gourdon on the borders of Perigord." B.L.G. But the earliest member of the family there mentioued is Sir Adam de G., who was keeper of Wolmer Forest, co. Hants, temp. Edward I.