Cognomen Kosiyah (Kosiyah 
) , in all the world, is a very rare last name. The surname Kosiyah is characteristic of Indonesia, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and India. Likewise, Kosiyah is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosiyah | Indonesia, Malaysia, Thailand, India |