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