Research Notes:
Keats-Rohan states, [1]
Robert son of Robert de Umfraville, granted the barony of Prudhoe, Norhtumberland, by Henry I. He d.c. 1145 leaving a son Odinel I (Sanders, 73). An association with the Giffards of Bolbec suggests he was named from Offramville, Seine-Maritime, arr. Dieppe (Loyd, 108).
[1] K. S. B. Keats-Rohan, Domesday Descendants, A Prosopography of persons occurring in English documents, 1066-1166: II Pipe Rolls to Cartae Baronum (Boydell Press, 2002), 753.