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