Cognomen Istia (Istia 
) , all around the world, is quite a rare last name. The surname Istia is characteristic of Indonesia, where it is a rare surname, Malaysia, where it is an extremely rare surname, and Spain. Not in comparison with a country's population, it most frequently occurs in Indonesia, India, and Malaysia. Likewise, Istia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Istia | Indonesia, Spain, Malaysia, Mexico, India |