Last name Siddons (Siddons 
) , across the world, is quite a rare family name. The cognomen Siddons is characteristic of the United Kingdom, where it is quite a rare surname, New Zealand, where it is a rare surname, and Australia. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| Siddons | Australia, Canada, New Zealand, United Kingdom, United States |
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william siddons English actor (1744-1808) (b. 1744) |
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sarah siddons Welsh actress (1755-1831), GB (b. 1755) |
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henry siddons British actor (b. 1774) |
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harriet siddons Scottish actress and theatre manager, GB (b. 1783) |
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| sarah martha siddons (born 1775) (b. 1775) |
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| maria siddons (1779-1798), Eldest daughter of Sarah Siddons (b. 1779) |
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| emma siddons (born 1780) (b. 1780) |
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| frances emilia siddons (born 1781) (b. 1781) |
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| george john siddons (1785-1848) (b. 1785) |
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| eliza ann siddons (b. 1782) |
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| cecilia siddons (1794-1868) (b. 1794) |
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| j. h. siddons born 1800; died 1885 (b. 1800) |
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| sarah siddons (born 1803) (b. 1803) |
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| elizabeth harriet siddons (born 1804) (b. 1804) |
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| frances sarah parr siddons (1808-1878) (b. 1808) |
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