According to the National Archives
Although Domesday contains many thousands of names it is probable that only two families can, with any certainty, trace their lineage back in the male line to an Anglo-Saxon forebear mentioned in Domesday. Anglo-Norman ancestors who held large estates and are often given surnames in Domesday are easier to trace. But even here the problem remains that between 1086 and 1154, the date of the first continuous series of public records, there is a gap in the archives.
Stan