Last name コシミズ (コシミズ 
, Koshimizu 
) , in all the world, is a rare surname. The cognomen コシミズ is habitual in Singapore, where it is a rare surname, Brazil, where it is a very rare surname, and Japan. Measured by absolute frequency, it most frequently occurs in Brazil, the United States, and Japan. More frequently, コシミズ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| コシミズ | Japan |
| Koshimizu | Brazil, United States, Indonesia, Japan, China |