Ó hAidith
Ó hAIDITH—I—O Hidia, Haidee, Haidy; 'descendant of Aidith' (humility); also written Ó hAideith, Ó hAididhe, &c.; the name (1) of an Ulidian family who were lords of Ui Eathach, now the barony of Iveagh, Co. Down, from about the middle of the 10th to the middle of the 12th century, when they were superseded by the Maguinnesses; and (2) of a Connacht family, mentioned by MacFirbis. The name, which is now extremely rare, is current about Shrule, Co. Mayo, in the modernised forms of Ó hÉididh and Ó hÉadeadha, which see.
Alphabetical Index to Irish Surnames