Family name Trevethan (Trevethan 
) , throughout the world, is a rare cognomen. The family name Trevethan is habitual in Australia, where it is a rare surname, United Arab Emirates, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, Australia, and the United Kingdom.
| VARIANT | COUNTRY |
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| Trevethan | United Kingdom, Australia, United States, South Africa, United Arab Emirates |
| richard m. trevethan British First World War flying ace, GB (b. 1895) |
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| herbert edgar h. trevethan (b. 1910) |
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| enrique bazañez trevethan Mexican politician, MX (b. 1957) |
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| ian stuart trevethan (born 1979) (b. 1979) |
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| robert trevethan researcher |
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| robert trevethan researcher (ORCID 0000-0002-7098-1321) |
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| robert trevethan Peerage person ID=118678 |
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| timothy paul trevethan (born 1980) (b. 1980) |
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| thomas trevethan researcher |
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| paul trevethan Peerage person ID=418192 |
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| douglas scott trevethan (born 1981) (b. 1981) |
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| dimity jane trevethan (born 1986) (b. 1986) |
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