Cognomen Istiyawati (Istiyawati 
) , around the globe, is a rare last name. The family name Istiyawati is characteristic of Indonesia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Istiyawati is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Istiyawati | Indonesia, United States |