Surname Cusack (Cusack 
, קיוזאק 
) , in the entire world, is quite a common last name. The cognomen Cusack is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in the United States, Australia, and Ireland.
| VARIANT | COUNTRY |
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| Cusack | United Kingdom, Australia, Ireland, United States, Canada |
| קיוזאק | Israel |
| thomas cusack Anglo-Irish Master of the Rolls, Lord Chancellor, and Chancellor of the Exchequer of Ireland (b. 1490) |
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| adam cusack Irish judge (b. 1601) |
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| nicholas cusack (born 1638) (b. 1638) |
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| james cusack (1656-1722) (b. 1656) |
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| athanasius cusack (born 1749) (b. 1749) |
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margaret anna cusack Irish Anglican nun, Roman Catholic nun (1832-1899), IE (b. 1832) |
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| james william cusack Irish surgeon, President of the RCSI (b. 1788) |
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| george cusack (born 1790) (b. 1790) |
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| cusack roney (b. 1781) |
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thomas cusack American politician, US (b. 1858) |
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thomas cusack Catholic bishop, US (b. 1862) |
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john cusack Australian politician, AU (b. 1868) |
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| henry thomas cusack (1820-1865) (b. 1820) |
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| mary anne cusack (1823-1906) (b. 1823) |
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| james william cusack (1824-1868) (b. 1824) |
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