Cusack Family History
Cusack Surname Meaning
Irish (of Norman origin): habitational name from Cussac in Guienne, France, named with the Gallo-Roman personal name Cūcius or Cussius + the locative suffix -acum.
The surname died out in England, but is common in Ireland, where it was imported at the time of the Anglo-Norman invasion in the 12th century.
It has been Gaelicized as de Cíosóg.
Source: Dictionary of American Family Names 2nd edition, 2022