Cognomen Trethewey (Trethewey 
) , all over the world, is quite a rare surname. The cognomen Trethewey is habitual in Australia, where it is quite a rare surname, New Zealand, where it is a rare surname, and Ireland. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Australia.
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| Trethewey | United Kingdom, South Africa, Australia, United States, Canada |
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william trethewey New Zealand sculptor (1892-1956), NZ (b. 1892) |
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| william thomas trethewey William T. Trethewey, W. T. Trethewey; Birth date 1893 Death date 1956 Birth place Christchurch Birth country New Zealand, NZ (b. 1893) |
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| robert trethewey Australian Liberal politician of the 20th Century (b. 1902) |
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natasha trethewey American poet, US (b. 1966) |
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| peter trethewey Australian cricketer, AU (b. 1935) |
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| tom trethewey American swimmer, US (b. 1944) |
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| fred trethewey British Archdeacon (b. 1949) |
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| richard trethewey American television personality, US (b. 1956) |
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| samuel p trethewey researcher |
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| ruth trethewey researcher |
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| bridget trethewey UK election candidate |
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| wendy trethewey CA |
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