Guillaume de Peche was born circa 1038 in Brittany, France and died 1100 Suffolk, England of unspecified causes. He married Isilia de Bourges (-1121) .
Children
| Name | Birth | Death | Joined with |
| Hamon de Peche (-1178) | 1100 England | 29 September 1178 Hampshire, England | Alice Peverel (-1188) |
Siblings