Globally, Seijun (Seijun 
) is a very rare principally boy's, but scarcely girly given name. The given name Seijun is habitual in Latin America and the Caribbean, particularly Puerto Rico, where it is quite a rare male name. Likewise, Seijun is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Seijun | Japan, China, Puerto Rico, India, Brazil |
| kunigami seijun Sanshikan of Ryukyu (b. 1511) |
|