Surname Menthonnex (Menthonnex 
) , throughout the world, is a rare family name. The cognomen Menthonnex is habitual in Switzerland, where it is a rare surname, France, and the United States, where it is an extremely rare surname. Much less frequently, Menthonnex is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Menthonnex | Switzerland, France, United States |
| rudolph menthonnex (1929-1979), CH (b. 1929) |
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| joseph menthonnex FR |
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| georgette menthonnex FR |
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