Family name О. (O 
, O. , О. 
) , in all the world, is a widespread last name. The last name О. is characteristic of Venezuela, where it is a common surname, Vanuatu, where it is quite a common surname, and Myanmar (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in China, Indonesia, and Venezuela. Also, О. is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| O, O. | Canada, Japan, Indonesia, China, Venezuela |
| О. | Serbia, Russia, Bulgaria, Belarus, China |