Geoffrey de Say was born on an unknown date to William de Say (-c1086) and Agnes de Grandmesnil (-1094) and died circa 1112 England of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| William de Say (-1144) | 1106 England | August 1144 Battle of Barnwell Castle | Beatrice de Mandeville (-1197) |
Siblings
| Name | Birth | Death | Joined with |
| Geoffrey de Say (-c1112) | 1112 England | ||
| Jordan de Say (-c1152) | 1090 Sawbridgeworth | 1152 Clun | Lucie de Lacy Lucy de Rumilly |