Surname オー (O 
, Oh , オー ) , across the world, is a widespread last name. The cognomen オー is characteristic of Singapore, where it is a common surname, Venezuela, and Vanuatu, where it is quite a common surname (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, オー is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oh, O | Canada, Venezuela, Indonesia, Japan, China |
| オー | Japan |