Last name Sydenham (Sydenham 
) , all around the world, is quite a rare family name. The cognomen Sydenham is characteristic of Isle of Man, where it is quite a rare surname, Australia, and the United Kingdom, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in the United Kingdom, Australia, and the United States. Much less frequently, Sydenham is the forename as well as the last name.
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| Sydenham | Canada, United Kingdom, United States, South Africa, Australia |
| jane sydenham Peerage person ID=680884 (b. 1438) |
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| john sydenham (by 1493-1557) of Brimpton, Som (b. 1494) |
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| elizabeth sydenham d.1598 (b. 1562) |
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thomas sydenham English doctor (1624-1689), GB (b. 1624) |
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| william sydenham English politician (b. 1615) |
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| martha sydenham Wife of William Lawrence (b. 1622) |
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philip sydenham English politician (c. 1673-1739) (b. 1676) |
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| john sydenham English politician (b. 1643) |
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| sydenham malthus M; born 1754; died 1821 (b. 1754) |
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| sydenham teast (b. 1755) |
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sydenham moore American politician (1817-1862), US (b. 1817) |
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sydenham elnathan ancona American politician (1824-1913), US (b. 1824) |
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| thomas sydenham British diplomat (1780-1816). Minister to Portugal 1814, CH (b. 1780) |
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| sarah sydenham (1781-1871) (b. 1781) |
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| john sydenham Antiquary, author and editor (b. 1807) |
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