Last name Montsec-Ager (Montsec-Ager 
) , globally, is a very rare surname. The last name Montsec-Ager is characteristic of Southern Europe, particularly Spain, where it is a very rare surname. Parts of the name also exists independently as a last name Ager.
| VARIANT | COUNTRY |
|---|---|
| Montsec-Ager | Spain |