O'Cahill, Daniel Duff (c.1580–c.1660), harper, was born in Barrymore, Co. Cork, son of Cormac O'Cahill, and nephew (or other relative) of Daniel Oge O'Cahill, harper in Barrymore, referred to in inquisitions of 1585 and 1606. O'Cahill seems to have commenced his…