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