Surname Cosain (Cosain 
) , globally, is quite a rare last name. The surname Cosain is habitual in Philippines, where it is quite a rare surname, Saudi Arabia, where it is a rare surname, and Mexico. Much less frequently, Cosain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cosain | Philippines, Saudi Arabia, United States, Mexico, South Africa |