Surname Seigaku (Seigaku 
) , in the world, is quite a rare family name. The cognomen Seigaku is characteristic of Japan, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, Seigaku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Seigaku | United States, Japan |