Padraig Mac Giolla-Domhnaigh

Dagnall—Some Irish people of the name of Duignan and Dignan (O'Duibhgeannain) in Lancashire have assumed the name of Dagnall, a common name in Lancashire. This is not an isolated case, because several other names have been changed by Irish people in England. It is not so common in Scotland. See Johnston and Johnson.

Alphabetical Index of Anglicised Surnames in Ireland

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