Cognomen Thornborrow (Thornborrow 
) , worldwide, is a rare family name. The last name Thornborrow is characteristic of the United Kingdom, where it is a rare surname, New Zealand, and Canada. Measured by absolute frequency, it is the most numerous in the United Kingdom, the United States, and Canada. Much less frequently, Thornborrow is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Thornborrow | United Kingdom, Australia, United States, Canada, New Zealand |
| barbara thornborrow Canadian military personnel, CA (b. 1951) |
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| joanna thornborrow (b. 1957) |
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| wayne thornborrow former Australian rules footballer (b. 1972) |
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| chris thornborrow |
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