Some websites claim that the surname Kersan(d)t is anancient Scottish name that was first used by the Strathclyde-Briton people of the Scottish/English Borderlands. The original bearer of the name lived in Dumfriesshire, where they settled prior to the Norman Conquest of England in 1066. The many spelling variations in Medieval Scottish names result from the fact that scribes in that era spelled words according to sound. Translation too, was an undeveloped science, and many names were altered into complete obscurity. Over the years Kersant has been spelled Carson, Carsen and others.
First found in Dumfriesshire, where they held a family seat from very ancient times, some say well before the Norman Conquest and the arrival of Duke William at Hastings in 1066 A.D.