Cognomen Oill (Oill 
) , in all the world, is a very rare surname. The surname Oill is characteristic of Northern America, particularly Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Oill is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oill | China, Canada, United States |