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 | Kazakhstan, Uzbekistan, Russia, Tajikistan, Kyrgyzstan |
| Туычи | Russia |
| Tuychi | Brazil, Russia, United States |