Last name Янлонг (Janlong 
, Янлонг 
, Ianlong 
) , throughout the world, is a very rare surname. The family name Янлонг is characteristic of Thailand, where it is a very rare surname, Nigeria, where it is an extremely rare surname, and China. Also, Янлонг is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janlong | Nigeria, India, Thailand |
| Янлонг | Russia |
| Ianlong | Cambodia, United States, China |