Cognomen Youichi (Youichi 
) , all around the world, is a rare family name. The family name Youichi is habitual in Indonesia, where it is a very rare surname, China, where it is an extremely rare surname, and the United States. Likewise, Youichi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Youichi | Philippines, United States, Indonesia, Japan, China |