Surname O S (O S 
) , across the world, is a very rare family name. The last name O S is habitual in Indonesia, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and India. More frequently, O S is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| O S | Canada, United Kingdom, India, Netherlands, Indonesia |