Cognomen Тійт (Tiit 
, Тійт 
) , across the world, is a rare last name. The surname Тійт is habitual in Estonia, where it is quite a common surname, Finland, where it is a rare surname, and the United States, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Estonia, China, and Finland. Also, Тійт is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tiit | Sweden, China, Spain, Estonia, Finland |
| Тійт | Ukraine |