Last name O'B (O'B 
) , in the world, is a very rare family name. The surname O'B is habitual in Ireland, where it is a rare surname, Morocco, where it is a very rare surname, and Australia. Very seldom, O'B is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| O'B | Colombia, Australia, United States, Ireland, Morocco |