Last name Kosain (Kosain 
) , in the world, is a rare cognomen. The family name Kosain is characteristic of Saudi Arabia, where it is a very rare surname, Philippines, and India, where it is an extremely rare surname. Likewise, Kosain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosain | Saudi Arabia, Philippines, India, Pakistan, Myanmar |