Surname Bainun (Bainun 
) , globally, is a rare cognomen. The surname Bainun is habitual in South-eastern Asia, particularly Malaysia, where it is a rare surname, Indonesia, where it is a very rare surname, and Thailand. Also, Bainun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bainun | Indonesia, Malaysia, Philippines, Thailand, India |