This surname of HEASLEWOOD was a locational name 'of Hazlewood' in Derbyshire. Almost every city, town or village existing in the Middle Ages has served to name one or more families. Where a man lived was his means of identification. When a man left his birthplace or village where he had been known, and went elsewhere, people would likely refer to him by the name of his former residence or birthplace, or by the name of the land which he owned. Early records of the name mention Heseleuuode (without surname) listed as a tenant in the Domesday Book of 1086. Many of the early names recorded in medieval documents denote noble families but many also indicate migration from the continent during, and in the wake of, the Norman invasion of 1066. There was a constant stream of merchants, workman and others arriving in England during this time. In 1086 the Record of Great Inquisition of lands of England, their extent, value, ownership and liabilities was made by order of William The Conquerer. It is known as the Domesday book. Heselwode (without surname) was documented in Derbyshire in 1188. Ricardus de Hesilwode was listed in the Yorkshire Poll Tax of 1379 as were Robertus de Heselwode and John Hesilwode in the same year. John Hasylwood and Katheryne West were married at St. Michael, Cornhill, London in the year 1553. The rise of surnames, according to the accepted theory, was due to the Norman Conquest of 1066. It is often assumed that men 'adopted' their surnames. Some certainly did, but the individual himself had no need for a label to distinguish him from his fellows. The development of the feudal system made it essential that the king should know exactly what service each knight owed. Payments to and by the exchequer required that debtors and creditors should be particularized. Monasteries drew up surveys and extents with details of tenants of all classes in their services. Any description which identified the man was satisfactory, his father's name, the name of his land, or a nickname known to be his. The upper classes mostly illiterate, were those with whom the officials were chiefly concerned and among them surnames first became numerous and hereditary. The associated arms are recorded in Sir Bernard Burkes General Armory registered in Belton, County Rutland.