Cognomen Lumbak (Lumbak 
) , in all the world, is a very rare last name. The last name Lumbak is characteristic of South-eastern Asia, particularly Malaysia, where it is a very rare surname, and Philippines, where it is an extremely rare surname. Also, Lumbak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lumbak | India, Malaysia, Philippines |