Fenton
Fenton—This name in the districts surrounding Killarney, Co. Kerry, and of Mitchelstown, Co. Cork, is respectively the anglicised form of Fenaghty (O'Fionnachta) and Fieghney (O'Fiachna).
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees