Mac An Ghallóglaigh
Mac an GHALLÓGLAIGH—VII—M'Agaloglie, MacGallogly, Gallogly, by 'translation,' English, Englishby, and by assimilation, Ingoldsby; 'son of the gallowglass' (Irish 'gallóglach'); formerly a Donegal surname; now found chiefly in Louth and Meath.
Alphabetical Index to Irish Surnames