Cognomen 外林 (外林 
, Sotobayashi 
) , across the world, is a very rare surname. The surname 外林 is habitual in China, where it is an extremely rare surname, and the United States. More prevalently, 外林 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 外林 | China |
| Sotobayashi | United States |