This surname of BLALOCK was derived from the Old English word BLAECLOCC, a nickname meaning one with black hair. The earliest of the name on record appears to be Peter Blacloke who was documented in 1275 in Warwickshire. Adam Blakelok appears in 1332 in County Surrey, and Robert Blaykelok was recorded in 1431 in County Yorkshire. Since the dawn of civilisation the need to communicate has been a prime drive of all higher mankind. The more organised the social structure became, the more urgent the need to name places, objects and situations essential to the survival and existence of the social unit. From this common stem arose the requirements to identify families, tribes and individual members evolving into the pattern in evidence today. In the formation of this history, common usage of customs, trades, locations, patronymic and generic terms were often adopted as surnames. The demands of bureaucracy formally introduced by feudal lords in the 11th century, to define the boundaries and families within their fiefdoms, crystallized the need for personal identification and accountability, and surnames became in general use from this time onwards. Later instances of the name mention William Blacklocke of County Cumberland, who registered at Oxford University in 1597, and William James married Mary Blacklock at St. George's Chapel, Mayfair, London in 1744. The name was early in Scotland and William Blakloche was the chaplain of the monastery of Dunfermlyne in 1483. Adam Blaiklok of the West Port of Edinburgh was hanged for perjury in 1615 and another Adam Blaiklok was the constable of the parish of Kirkpatrick-Juxta in 1617. A notable member of this name was Alfred BLALOCK (l899-l964) the American surgeon born in Culloden, Georgia. He received his medical education at John Hopkins University and at the Vanderbilt University Hospital. He performed the first blue baby operation and also did important experimental work. The Papers of Alfred Blalock (l966) collected many of his major contributions in a single volume.
The associated coat of arms is recorded in Sir Bernard Burkes General Armory. Ulster King of Arms in 1884. Registered in Scotland
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