Surname Sumbak (Sumbak 
) , around the world, is a very rare family name. The surname Sumbak is habitual in Estonia, where it is a rare surname, Australia, and Malaysia, where it is an extremely rare surname. In absolute terms, the name is most common in Australia, Brazil, and Philippines. Very seldom, Sumbak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sumbak | Estonia, Philippines, Australia, India, Brazil |