Cognomen Simbiak (Simbiak 
) , globally, is a rare surname. The surname Simbiak is characteristic of South-eastern Asia, particularly Indonesia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Simbiak | Indonesia |
| festus simbiak Indonesian politician (born 1952 in Biak Mokmer Ii), ID (b. 1952) |
|