Cognomen Smetankin (Smetankin 
, Сметанкин 
) , throughout the world, is quite a rare family name. The cognomen Smetankin is characteristic of Russia, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Belarus. Measured by absolute frequency, it is the most numerous in Russia, Kazakhstan, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Smetankin | Russia, Greece, Lithuania, Belarus, China |
| Сметанкин | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| stanislav smetankin chess player (b. 1980) |
|