In the world, Thomasin (Thomasin 
) is a rare feminine given name. The first name Thomasin is habitual in Australia, where it is a very rare female name, the United Kingdom, and the United States. Not in comparison with a country's population, this name is the most popular in the United States, India, and the United Kingdom. Very seldom, Thomasin is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Thomasin | United Kingdom, Myanmar, Switzerland, United States, India |
| thomasin filgate (1696-1765) (b. 1696) |
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| thomasin buller (born 1730) (b. 1730) |
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| thomasin filgate (born 1748) (b. 1748) |
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| thomasin sarah gilbey (born 1947) (b. 1947) |
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| thomasin margaret guinness (born 1947) (b. 1947) |
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| thomasin grim American textile artist (b. 1957) |
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| thomasin barret Peerage person ID=300881 |
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| thomasin amandas Peerage person ID=24815 |
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| thomasin andrews researcher |
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| thomasin honywood - Bef 17 Jan 1677/8 (date will proven) |
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| thomasin adams-webber researcher |
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| thomasin lyon (died 1859) |
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| thomasin lambton Peerage person ID=259976 |
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| thomasin albert stoodley Peerage person ID=34769 |
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| thomasin hanmer (died 1712) |
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