Godwin
Godwin—In the districts of Tuam, Co. Galway; of Cong, Co. Mayo; and of Ballinrobe, in North Sligo, the name of O'Dea (O'Diaghaidh) has been anglicised Godwin.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees