Ó Dathail
Ó DATHAIL—I—O Dahill, Dahill; 'descendant of Daithgheal' (fair complexion); also written Ó Daithghil; the name, according to MacFirbis, of a family of the Siol Muireadhaigh, in Co. Roscommon; now peculiar to Tipperary.
Alphabetical Index to Irish Surnames