Cognomen Tonku (Tonku 
) , all over the world, is a rare family name. The family name Tonku is habitual in Nigeria, where it is a very rare surname, India, and Russia, where it is an extremely rare surname. Also, Tonku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tonku | Russia, South Africa, Philippines, Nigeria, India |