Ó Coscair ( shortened form of Ó Coscraigh) aka Cosgrove / Cosgrave / Cosgreave / Cuskor / Coskor / Cusker and more ...
Descendant of Coscrach' (victorious); the name of a Wicklow family who were lords of Feara Cualann, comprising the manor of Powerscourt, until dispossessed by the o'Tooles and o'Byrnes (soon after the Cambro-Norman invasion).