Surname Otonashi (Otonashi 
) , in the entire world, is a very rare last name. The surname Otonashi is habitual in Mexico, where it is an extremely rare surname, Argentina, and Philippines. Not in comparison with a country's population, it is the most numerous in the United States, Mexico, and Philippines. More prevalently, Otonashi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Otonashi | Japan, Philippines, Mexico, United States, Brazil |
| kaori otonashi Japanese AV idol (b. 1981) |
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| sayaka otonashi Japanese AV idol (b. 1994) |
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