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This interesting surname, found in England, Scotland and Ireland, has a number of possible origins. Firstly, it may be of origin, from the pre 7th Century and "dunn", meaning "dull, brown, dark-coloured", and was a for a man with dark hair or a swarthy complexion. It may also have originated from an unrecorded Middle English survival of an Olde English , "Dunna", dark. Secondly, the surname is widespread in Ireland, where it is the form of the "O'Duinn, Doinn", composed of the Gaelic "O", male descendant of, and the "Duinn, oinn", from "donn", black, brown, a byname given to someone with dark hair or swarthy complexion, as above. In Ireland the name is usually spelt "Dunne", and the originated in County Leix and formed one of the principal families of where their chief was the Lord of Iregan; they were especially mentioned in mid 16th Century documents as hostile and dangerous to the English interest. Those who spelt their name Dunn usually came from Ulster, where they were possibly of Scottish extraction.

List Ancestral records for:- Dun

Finally, in Scotland, the surname also derives from this origin, but may also be from the lands of Dun, Tayside (Angus), which derives from "dun", fort. Early recordings include William Dun (1180, Gloucestershire), John Dun (1198, Hertfordshire), and Adam Dun (1255, Scotland). A granted to a Dunn Family in Bircher, near Leominster, depicts quarterly first and second , a wolf salient, second and third, three round gold buckles, tongues downward. The first recorded spelling of the family name is shown to be that of Gillananaomh O'Duinn, which was dated 1102, in the "Ancient Irish Records", during the reign of Irish in Opposition, 1103 - 1169. Surnames became necessary when governments introduced personal taxation. In England this was known as . Throughout the centuries, surnames in every country have continued to "develop" often leading to astonishing of the original spelling.
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Records about the Dun family

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