PERCY. William de Perci, who, with his brother Serlo, assisted in the Conquest of England, appears in Domesday as tenant in capite in many counties, especially in those of York and Lincoln. Perci is the name of a parish and canton near St. Lo, in Normandy, the ancient fief of the family. Dugdale traces the pedigree of William de Percy up to the Northman \Iainfi-ed, who settled in Neustria (Normandy) before the cession of that province to Rollo.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.