Surname 宜贞 (宜贞 
) , in all the world, is a very rare family name. The family name 宜贞 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 宜贞 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 宜贞 | China |