Surname Koonjan (Koonjan 
) , worldwide, is a very rare family name. The cognomen Koonjan is habitual in Trinidad and Tobago, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Very seldom, Koonjan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koonjan | United States, India, Trinidad and Tobago |