Last name Kosasi (Kosasi 
) , globally, is quite a rare cognomen. The surname Kosasi is habitual in South-eastern Asia, particularly Indonesia, where it is quite a rare surname, Singapore, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Indonesia, China, and Singapore. Much less frequently, Kosasi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosasi | Singapore, United States, Indonesia, Malaysia, China |