Surname Montanu (Montanu 
) , across the world, is a very rare last name. The last name Montanu is habitual in Romania, where it is a rare surname, and Brazil, where it is an extremely rare surname. Very seldom, Montanu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Montanu | India, Romania, Brazil |
| mihail montanu RO (b. 1949) |
|