Nestor
Nestor—This name is of Scottish origin, and some of its other forms are M'Kenestry, McNestry, and M'Kinstry; M'Kinstrie in Galloway. The name in Gaelic is Mac An Adhastair.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees