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