Padraig Mac Giolla-Domhnaigh

Hackett—This name in the district of Clogher and those adjoining is the anglicised form of M'Gaughy; in the districts of Lower Fews, Co. Armagh, the anglicised form of M'Gaugy, those two names being forms of each other, in Gaelic Mag Eachaidh.

In the districts surrounding Carrick-on-Shannon, Co. Roscommon, the name Guckian (Mag Uiginn [?]) has been anglicised to Hackett.

Alphabetical Index of Anglicised Surnames in Ireland

See also Woulfe’s Irish Names and Surnames
and O'Hart's Irish Pedigrees