Ó Laochdha
Ó LAOCHDHA—I—O Leaghy, O Leahy, Leahy, Leehy, &c.; 'descendant of Laochdha' (heroic); an old Munster surname; now very common in Cork, Kerry, Limerick and Tipperary; to be distinguished from Ó Lathaigh, which is sometimes similarly anglicised.
Alphabetical Index to Irish Surnames