In your search on the Grays of Jamaica it is important to note that not all Greys/Grays are blood related. As with many other families in Jamaica, there are Grey/Gray families who inherited the name from their slave masters at their christian baptisims. This has made my own research very difficult but I have copies of several wills of my ancesters which have been quite resourceful in identifying my true relatives. I am not sure how far back you have checked but I may be able to assist as I am a blood relative of the original Grey/Gray families who first came to Jamaica in the 1500's.