Surname Sidney (Sidney 
, סידני 
, Сидни 
, among others...) , throughout the world, is a common cognomen. The last name Sidney is habitual in Jersey, where it is quite a common surname, Cabo Verde, and Haiti, where it is quite a rare surname. In absolute terms, it most frequently occurs in the United States, Nigeria, and Mexico. More prevalently, Sidney is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sidney | Brazil, United States, United Kingdom, Democratic Republic of the Congo, South Africa |
| סידני | Israel |
| Сидни | Lithuania, Russia |
| Сидней | Kyrgyzstan, Russia, Ukraine |
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henry sidney English politician and courtier, GB (b. 1529) |
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philip sidney English poet, courtier, diplomat (1554-1586), GB (b. 1554) |
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mary sidney Countess of Pembroke, poet, and literary patron, GB (b. 1561) |
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robert sidney, 1st earl of leicester English noble and diplomat (1563-1626), GB (b. 1563) |
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robert sidney, 2nd earl of leicester English noble and politician (1595-1677), GB (b. 1595) |
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dorothy sidney, countess of leicester English noble, GB (b. 1598) |
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dorothy sidney English beauty (b. 1617) |
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philip sidney, 3rd earl of leicester English politician, GB (b. 1619) |
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algernon sidney British politician and political theorist (1623-1683), GB (b. 1623) |
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john sidney, 6th earl of leicester English politician and Earl, GB (b. 1680) |
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| robert sidney, 4th earl of leicester English noble (b. 1649) |
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| philip sidney, 5th earl of leicester Member of Parliament (1676-1705) (b. 1676) |
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| jocelyn sidney, 7th earl of leicester English noble, GB (b. 1682) |
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sabrina sidney British foundling girl taken in when she was 12 by author Thomas Day, GB (b. 1757) |
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| philip sidney (1778-1799) (b. 1778) |
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