Surname Trewin (Trewin 
) , around the world, is quite a rare cognomen. The family name Trewin is habitual in Australia, where it is quite a rare surname, Nicaragua, and the United Kingdom, where it is a rare surname. Measured by absolute frequency, the name is most common in Australia, the United Kingdom, and the United States. Much less frequently, Trewin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Trewin | Canada, United Kingdom, Sri Lanka, United States, Australia |
| j. c. trewin English journalist, GB (b. 1908) |
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| tom trewin Australian politician (b. 1914) |
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| max trewin Australian rules footballer (1927-2005) (b. 1927) |
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| trewin copplestone (b. 1921) |
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| ion trewin British editor, publisher and author, GB (b. 1943) |
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| dennis trewin Australian statistician, AU (b. 1946) |
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| janet katherine trewin (born 1956) (b. 1956) |
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| robert shane trewin (1957-1957) (b. 1957) |
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| helen elizabeth trewin Peerage person ID=445418 (b. 1958) |
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| todd trewin American equestrian, US (b. 1958) |
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| glenda may trewin (born 1960) (b. 1960) |
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| kerrie joy trewin (born 1962) (b. 1962) |
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| jeannie christine trewin (born 1965) (b. 1965) |
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| simon trewin literary agent (b. 1966) |
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| penelope jane trewin Peerage person ID=445422 (b. 1971) |
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