Cognomen Marnas (Marnas 
) , around the globe, is a rare surname. The cognomen Marnas is habitual in France, where it is a rare surname, Greece, and Indonesia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in France, Indonesia, and Pakistan. Very seldom, Marnas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Marnas | France, India, Greece, Pakistan, Indonesia |
| louis françois chabanacy de marnas French politician, FR (b. 1809) |
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| francisque-jean-etienne marnas Roman Catholic bishop, FR (b. 1859) |
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| catherine marnas French theatre director, FR (b. 1955) |
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Mr, Herve, India, Martin, Marcel, Maxime, Samina, Sophie, Sylvie, Albert, Chloé, Celine, Claude, Pascal, Pierce, Romain, Robert, Dorian, Gerard, Gilles, Gladys, Leonie, Elise, Julie, Joris, Lucie, Ms, Guy, Lea, Marc, Benj, Paul, Rene, Ludo, Jean, Eric, Jeremy, Frã, Yves, Marie, Manon, Sandi, Alain, Andre, Chris, Roger, David, Laure, Iful, and Jerome