Surname Sadaharu (오 
, Sadaharu 
) , around the world, is a widespread family name. The family name Sadaharu is characteristic of Eastern Asia, particularly South Korea, where it is a common surname, and Japan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| 오 | South Korea |
| Sadaharu | Japan, France, Mexico, Brazil, United States |