Family name Defontenay (Defontenay 
) , all around the world, is a rare cognomen. The last name Defontenay is characteristic of France, where it is a rare surname, Canada, where it is an extremely rare surname, and the United States. Very seldom, Defontenay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Defontenay | United States, France, Canada |
| alexandre defontenay French politician, FR (b. 1748) |
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| jacques defontenay French politician (1796-1879), FR (b. 1796) |
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| charlemagne ischir defontenay French writer, FR (b. 1819) |
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| thierry defontenay French politician, FR (b. 1955) |
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| julien defontenay FR (b. 1980) |
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