Last name Тыну (Tonu 
, Tõnu 
, Тыну 
) , worldwide, is quite a common surname. The surname Тыну is habitual in Moldova, where it is quite a common surname, Bangladesh, where it is quite a rare surname, and Romania. Likewise, Тыну is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tonu | Ethiopia, Romania, Moldova, India, Bangladesh |
| Tõnu | Finland, Estonia, Sweden, United States |
| Тыну | Estonia, Russia |
| Tynu | Malaysia, India, United States |