Carson
Carson—This name is of Picto-Cymric origin in the ancient kingdom of Strathclyde, and was written in the early centuries Ap' Corsane, and later Corsan. One of the name was Vicar of Dumfries in 1400, and Sir John Ap' Corsan flourished in 1469. One of the name was Provost of Dumfries.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees