Cognomen Deniau (Deniau 
, دينيو) , all over the world, is quite a rare last name. The last name Deniau is characteristic of France, where it is quite a rare surname, Belgium, where it is a very rare surname, and Argentina. Measured by absolute frequency, it is commonest in France, the United States, and Argentina. Very seldom, Deniau is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Deniau | Belgium, France, United States, Canada, Argentina |
| pierre deniau FR (b. 1778) |
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| eugène deniau French politician, FR (b. 1834) |
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| octave deniau FR (b. 1839) |
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jean-françois deniau French politician, diplomat and author (1928–2007), FR (b. 1928) |
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| roger, aurélien deniau French politician, FR (b. 1899) |
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| sylvie deniau French actress, FR (b. 1919) |
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| xavier deniau French politician, FR (b. 1923) |
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| georges deniau French tennis player, FR (b. 1932) |
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| francis deniau French Bishop, FR (b. 1936) |
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| jean-charles deniau French film director, FR (b. 1945) |
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| anne deniau French photographer, FR (b. 1953) |
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| michel deniau FR (b. 1944) |
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| joël deniau French politician, FR (b. 1955) |
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| françois-xavier deniau French diplomat, FR (b. 1955) |
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| michel deniau FR (b. 1950) |
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