Surname Demonts (Demonts 
) , all around the world, is a very rare cognomen. The cognomen Demonts is habitual in France, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Demonts is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demonts | Spain, United States, France |
| charles demonts French official (1815-1883), FR (b. 1815) |
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| louis demonts French art historian and curator, FR (b. 1882) |
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