Cognomen Tonooka (Tonooka 
) , all over the world, is a very rare family name. The last name Tonooka is habitual in Brazil, where it is a very rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Much less frequently, Tonooka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tonooka | United Kingdom, China, Brazil, United States |
| sumi tonooka American musician, US (b. 1956) |
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| taishi tonooka researcher |
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