Surname 初日 (Shonichi 
, 初日 
) , around the globe, is a very rare last name. The cognomen 初日 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. Much more frequently, 初日 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Shonichi | Japan |
| 初日 | China |