Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DEROY
As described in historical dictionaries
Patronymica Britannica (1860)
DEROY. The map of Normandy exhibits many localities called ' Le Coudray,' meaning a wood or grove of hazels. There is also an estate called Cowdray, near Midhurst, CO. Sussex. De CoucU-ay. H.R.