Cognomen 熟弟 (熟弟 
) , throughout the world, is a very rare last name. The cognomen 熟弟 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 熟弟 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 熟弟 | China |