De Grae
de GRAE—XI and XII—de Grey, de Graye, Grey, Gray; (1) Norman 'de Grey,' i.e., of Grey, some spot in England, probably; (2) Norman 'le Grey,' i.e., the grey, from the colour of the hair. Both forms occur in early Irish records, but 'de Grey' was by far the more common.
Alphabetical Index to Irish Surnames