De Carduibh
de CARDUIBH—XI—de Cardif, de Kerdyff, Cardiff, Kerdiffe; Norman 'de Cardif,' i.e., of Cardiff in Wales. Families of this name settled at an early period in Dublin, Meath, Kildare and Wexford. The name, though never very common, still survives in Leinster.
Alphabetical Index to Irish Surnames