Surname Ишии (Ishii 
, Ишии 
) , all over the world, is quite a common last name. The cognomen Ишии is habitual in Paraguay, where it is quite a rare surname, Singapore, and Japan. Not in comparison with a country's population, it most frequently occurs in Japan, the United States, and Brazil. Much less frequently, Ишии is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ishii | Japan, China, Indonesia, United States, Brazil |
| Ишии | Russia |