Across the world, 膝玉 (膝玉 
) is a very rare girly first name. The forename 膝玉 is habitual in Eastern Asia, particularly China, where it is an extremely rare feminine name. Very seldom, 膝玉 is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 膝玉 | China |