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