Surname Demontis (Demontis 
) , all over the world, is quite a rare last name. The family name Demontis is characteristic of Italy, where it is quite a rare surname, France, where it is a rare surname, and Ireland. Not in comparison with a country's population, it most frequently occurs in Italy, France, and Germany. Very seldom, Demontis is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demontis | Germany, United Kingdom, Italy, Argentina, France |
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paolo demontis Italian harmonica player, IT (b. 1974) |
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| geneviève demontis French politician, FR (b. 1955) |
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| fabio demontis researcher |
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| maria antonietta demontis researcher |
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| gian carlo demontis researcher |
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| valeria demontis Italian physicist, IT |
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| cristina demontis researcher |
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| d demontis researcher |
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| françois demontis French politician, FR |
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| roberto demontis researcher ORCID ID = 0000-0003-2306-9767 |
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| mark demontis |
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| luca demontis IT |
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Mr, Dino, Gaia, Gian, Gigi, Lina, Lisa, Lory, Luca, Joan, Jean, Juan, Tony, Tove, Elia, Elsa, Enzo, Hugo, Vale, Vity, Fede, Iris, Dany, Irma, Desy, Rino, Ms, Ale, Lea, Lou, Flo, Uta, Ugo, Marc, Mark, Sara, Alex, Alba, Aldo, Anto, Anna, Kate, Pina, Pino, Pier, Rosa, Rosy, Rita, and Ivan