Surname Herwan (Herwan 
) , worldwide, is a rare family name. The cognomen Herwan is habitual in South-eastern Asia, particularly Singapore, where it is a rare surname, Malaysia, and Indonesia. In absolute terms, it most frequently occurs in Indonesia, Malaysia, and Japan. More prevalently, Herwan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Herwan | Japan, Malaysia, France, Singapore, Indonesia |