Surname Усмонбек (Усмонбек 
) , throughout the world, is an extremely rare last name. The cognomen Усмонбек is habitual in Kyrgyzstan, where it is a very rare surname, and Russia, where it is an extremely rare surname. Predominantly, Усмонбек is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Усмонбек | Kyrgyzstan, Kazakhstan, Russia |