Ó Dathlaoich
Ó DATHLAOICH—I—O Dolly, Dolly; 'descendant of Dathlaoch' (bright or nimble hero); the name of a Galway family who were anciently chiefs of Ui Briúin Ratha, to the east and north-east of the town of Galway, where it is still represented.
Alphabetical Index to Irish Surnames