Surname 級 (Kyu 
, 級 
) , around the world, is a common family name. The last name 級 is characteristic of Mongolia, where it is quite a common surname, Myanmar, and South Korea, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Myanmar, Mongolia, and Indonesia. Likewise, 級 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kyu | Japan, Myanmar, Mongolia, Indonesia, South Korea |
| 級 | China |