Cognomen Tuychi (Туйчи 
, Туычи , Tuychi 
) , in the entire world, is a very rare family name. The surname Tuychi is habitual in Kyrgyzstan, where it is a rare surname, Russia, where it is an extremely rare surname, and Brazil. Much more prevalently, Tuychi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Туйчи | Uzbekistan, Kazakhstan, Tajikistan, Russia, Kyrgyzstan |
| Туычи | Russia |
| Tuychi | Russia, United States, Brazil |