Family name أو (O 
, O. , Ou 
) , across the world, is a widespread cognomen. The surname أو is habitual in Venezuela, where it is a common surname, Macao, where it is quite a common surname, and Vanuatu (explore the name in all countries). In absolute terms, the name is most common in China, Indonesia, and Venezuela. Likewise, أو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| O, O. | Japan, China, Indonesia, Canada, Venezuela |
| Ou | China, Indonesia, Canada, Myanmar, Venezuela |
| أو | Morocco, Egypt |