Ó hAiseadha
Ó hAISEADHA—I—O Hassia, O Hassey, O Hassett, Hassey, Hassett; 'descendant of Aisidh' (strife, discord); the name of an old Thomond family of the same stock as the MacNamaras, being a branch of Clann Chuileain. The name is still well known in the neighbourhood of the city of Limerick and in other parts of Munster.
Alphabetical Index to Irish Surnames