Surname Marnay (Marnay 
) , across the world, is a rare cognomen. The surname Marnay is characteristic of France, where it is a rare surname, Mexico, where it is a very rare surname, and Australia. In absolute terms, the name is most common in France, Mexico, and the United States. Likewise, Marnay is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Marnay | Spain, Mexico, United States, France, Democratic Republic of the Congo |
| andré marnay French actor, FR (b. 1877) |
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| louis marnay FR (b. 1911) |
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audrey marnay French actress and model, FR (b. 1980) |
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| paul marnay FR (b. 1929) |
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