Surname Demachi (Demachi 
) , globally, is a very rare cognomen. The surname Demachi is characteristic of Canada, where it is an extremely rare surname, Italy, and the United States. Also, Demachi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demachi | Italy, United States, India, Canada, Brazil |
| giuseppe demachi Italian composer and violinist, IT (b. 1732) |
|