Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
GREELY
As described in historical dictionaries
Patronymica Britannica (1860)
GREELY. Local : probably in co. Rutland, as De Greley aud De Greyley are found there in H.E. temp. Edw. I.