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