Surname Treleaven (Treleaven 
) , globally, is a rare last name. The cognomen Treleaven is characteristic of Canada, where it is a rare surname, New Zealand, and Australia. Measured by absolute frequency, it is the most numerous in Canada, the United Kingdom, and the United States.
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| Treleaven | United Kingdom, Australia, United States, Canada, New Zealand |
| richard barrie treleaven (b. 1920) |
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| dick treleaven Ontario politician, CA (b. 1934) |
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| john treleaven British opera singer, GB (b. 1950) |
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| scott treleaven Canadian film director (b. 1972) |
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| emily treleaven researcher |
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| mike treleaven UK election candidate |
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| julia treleaven researcher |
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| cameron treleaven bookseller based in Calvary |
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| kyle treleaven Ph.D. Massachusetts Institute of Technology 2014 |
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