Last name Thornhill (Thornhill 
) , globally, is a common cognomen. The cognomen Thornhill is habitual in Barbados, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and the United Kingdom. In absolute terms, it is commonest in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Thornhill | United Kingdom, South Africa, Australia, United States, Canada |
| william thornhill English politician (b. 1500) |
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james thornhill British painter (1675-1734), GB (b. 1675) |
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| margaret thornhill (1633-1695) (b. 1633) |
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| george thornhill Peerage person ID=152522; (1655-1687), GB (b. 1655) |
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| lady judith thornhill Person; female; Wife of Sir James Thornhill the painter; British; 1673-1757 (b. 1673) |
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| everilda thornhill (1680-1733) (b. 1680) |
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| george thornhill Peerage person ID=161511; (1681-1754) (b. 1681) |
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| john thornhill British painter (b. 1700) |
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| william thornhill English surgeon (b. 1702) |
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| mary thornhill (b. 1715) |
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| george thornhill Peerage person ID=434258; (1738-1827), GB (b. 1738) |
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| gabrielle henriette catherine thornhill 1750 - 1803 (b. 1750) |
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| john thornhill British naturalist, from Durham, GB (b. 1760) |
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| thomas thornhill (1780-1844) (b. 1780) |
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| george thornhill English politician; (1783-1852) (b. 1783) |
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