Surname Намдаг (Намдаг 
) , across the world, is an extremely rare last name. The surname Намдаг is characteristic of Eastern Europe, particularly Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Намдаг | Russia |
| донровын намдаг Mongol poet and writer (1911-1984), MN (b. 1911) |
|