Cognomen Щелкин (Щелкин 
, Shchelkin , Schelkin 
) , throughout the world, is a rare family name. The last name Щелкин is habitual in Russia, where it is a rare surname, Kazakhstan, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Щелкин is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Щелкин | Kazakhstan, Russia |
| Shchelkin | Russia |
| Schelkin | United States |