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