In all the world, 宇弟 (宇弟 
) is a very rare masculine forename. The first name 宇弟 is habitual in Eastern Asia, particularly China, where it is an extremely rare male name. Very seldom, 宇弟 is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 宇弟 | China |