Research shows the name of Cyphus, Syphus, Cyphas, Sifers, Sierford and many other spelling MAY come from the area of Shefford often recorded in the old records after 1066 as SIFORD. It mean, "where the sheep cross". This area is in Gloucestershire, England. Roger d'Ivry from France received the area land along with Robert d'Oilly. They had several estates jointly in several shires. Roger also had land in Oxfordshire, England.
Later was also name, Sheppard,"watcher of sheep". Sheppard means, "Faith and Virture." Also Robert d'Ivry was known as BUTLER, "one who takes care".
Information from the Domesday Book aslo.
The German/French Sierford is not yet found to be connected to the English. But may have come to England with William the Conqueror in 1066. The first record found for Glacestrecir is in 1066. The Romans had named the place Glevum. My Sifor/Syphus name moved to Oxfordshire,England and lived in Leafield. Also found there is the spelling of Cyphas.