Surname Mounthault (Mounthault 
) , all over the world, is a rare cognomen. The family name Mounthault is habitual in the Democratic Republic of the Congo, where it is a rare surname, France, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mounthault | France, Democratic Republic of the Congo, United States |