Cognomen Demartis (Demartis 
) , in the world, is quite a rare family name. The last name Demartis is characteristic of Italy, where it is quite a rare surname, France, where it is a rare surname, and Hungary. Measured by absolute frequency, it is commonest in Italy, France, and the United States. Much less frequently, Demartis is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demartis | Italy, Argentina, United States, Germany, France |
| salvatore angelo maria demartis (1817-1902) (b. 1817) |
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| claudio demartis Italian politician, IT (b. 1869) |
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| james joseph demartis American painter, US (b. 1926) |
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| massimo demartis Italian association football player, IT (b. 1974) |
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| manuel demartis researcher, ORCID id # 0000-0001-5225-1045 |
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Mr, Joan, Tina, Elia, Vera, Ivan, Igor, Yves, Maria, Mario, Marco, Mauro, Mirko, Senia, Sonja, Sofia, Steve, Anita, Carlo, Carla, Carly, Cathy, John, Luca, Lino, Gina, Ms, Fra, Ica, Mary, Mara, Matt, Mike, Sara, Seby, Alex, Bruno, Aldo, Pete, Pino, Rosa, Rene, Rich, Rita, Dina, Gail, Gaia, Gian, Anna, and Paula