Cognomen Sussex (Sussex 
, ברייני 
) , around the world, is a rare last name. The cognomen Sussex is habitual in the United Kingdom, where it is a rare surname, New Zealand, and Hong Kong. Measured by absolute frequency, the name is most common in the United Kingdom, the United States, and Australia. Very seldom, Sussex is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sussex | Australia, Hong Kong, United States, New Zealand, United Kingdom |
| ברייני | Israel |
| cissa of sussex king of Sussex? (b. 500) |
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| osric of sussex maybe King of Sussex (b. 601) |
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| nothhelm of sussex English monarch (b. 601) |
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| æthelstan of sussex (b. 650) |
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| andhun of sussex Ealdorman of Sussex (b. 700) |
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| osmund of sussex (b. 700) |
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| oswald of sussex (b. 700) |
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| ealdwulf of sussex 8th-century English monarch (b. 800) |
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| sussex camock English privateer, GB (b. 1600) |
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| sussex william lennox (1831-1898) (b. 1831) |
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| sussex charles milford GB (b. 1825) |
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lucy sussex New Zealand writer, NZ (b. 1957) |
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| roland sussex Australian linguist, AU (b. 1950) |
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| andy sussex English footballer (born 1964), GB (b. 1964) |
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| paula sussex Chief Executive, Student Loans Company, since 2018 (b. 1964) |
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