The associated arms for HEASLETT are recorded in Sir Bernard Burkes General Armory. Ulster King of Arms in 1884. Granted to William Haslett Esq. of Londonderry and Summerhill, County Donegel, only son of William Haslett of Derrymount, County Derry. This originally English name (which is now found mainly in Northern Ireland) was derived from the Old English word HOESLETT, a derivative of Hazel, meaning 'one who lived by a hazel copse'. Local surnames, by far the largest group, derived from a place name where the man held land or from the place from which he had come, or where he actually lived. These local surnames were originally preceded by a preposition such as "de", "atte", "by" or "in". The names may derive from a manor held, from working in a religious dwelling or from literally living by a wood or marsh or by a stream.Ireland is one of the earliest sources of the development of patronymic names in northern Europe. Irish Clan or bynames can be traced back to the 4th century B.C. and Mac (son of) and O (grandson or ancestor of) evolved from this base, the original literal meaning of which has been lost due to the absence of written records and linguistic ambivalences which subtly but inexorably became adopted through usage. Genealogists and lexographers accept that the patronymic base does not refer to a location, quite the contrary. The use of the prefix 'Bally' (town of) attaching to the base name, identifying the location. The base root was also adopted by people residing in the demographic area without a common ancestor. These groups called 'Septs' were specially prevalent in Ireland. The first Normans arrived in Ireland in the 12th and 13th centuries to form an alliance with the King of Leinster. Under Elizabeth I in the 16th century, settlers from England established themselves around Dublin, then under English control and Presbyterian Scots emigrated to Ulster, introducing English and Scottish roots. Early records of the name mention Alured del Hesel who was documented in the year 1182, appears to be the first of the name on record. Gamel Hesel was documented in London in the year 1203, and Hugh de Hesill appears in Yorkshire in 1204. Edward Hassell of County Somerset, was recorded during the reign of Edward III (1327-1377). Cristians de Hesill of Yorkshire, was listed in the Yorkshire Poll Tax of 1379. Willelmus de Hesill, 1379.