Around the world, 口洋一 (口洋一 
) is a very rare boy's first name. The forename 口洋一 is characteristic of Eastern Asia, particularly China, where it is an extremely rare boy's name. Very seldom, 口洋一 is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 口洋一 | China |