Cognomen Mcwethy (Mcwethy 
) , around the globe, is a rare family name. The family name Mcwethy is characteristic of the United States, where it is a rare surname, the United Kingdom, where it is a very rare surname, and Canada.
| VARIANT | COUNTRY |
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| Mcwethy | Canada, United Kingdom, United States |
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robert d. mcwethy American military personnel (1920-2018), US (b. 1920) |
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| edgar lee mcwethy, jr. United States Army Medal of Honor recipient, US (b. 1944) |
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| john mcwethy American journalist, US (b. 1947) |
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| david b mcwethy researcher ORCID ID = 0000-0003-3879-4865 |
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