All around the world, Seiya (Seiya 
, セイヤ , سيا 
) is a rare mostly male, but seldom girly forename. The first name Seiya is habitual in Japan, where it is a rare masculine name, Iraq, where it is a rare gender-neutral name, and Indonesia, where it is a very rare epicene name. More prevalently, Seiya is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Seiya | Japan, China, Indonesia, Taiwan, Tanzania |
| セイヤ | Japan |
| سيا | Iran, Sudan, Algeria, Egypt, Iraq |
Seiya is also a name for the fictitious and mythical characters: .
| kunigami seiya (b. 1591) |
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| seiya abiko Japanese historian, science educator (b. 1942) |
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seiya kobayashi Japanese luger |
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| seiya ohta artist (b. 1964) |
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| seiya watanabe researcher (ORCID 0000-0002-6530-9047) |
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| seiya hirai researcher |
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| seiya nishizawa researcher ORCID ID = 0000-0001-9457-7457 |
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| seiya kato researcher (ORCID 0000-0003-1390-7229) |
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| seiya ito researcher |
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| seiya shimono researcher |
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| seiya tabuchi botanist |
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| seiya katahara researcher |
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| seiya kitamura researcher |
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| seiya inoue researcher (ORCID 0000-0003-0945-0000) |
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| seiya tanaka researcher (ORCID 0000-0003-3609-7740) |
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Mr, Super, Seint, Ariel, Belen, Karim, Kanie, Nitin, Entei, Ishii, Ikwal, Omoto, Makino, Sakara, Sakura, Shiryu, Alriko, Aveiro, Chandi, Carlos, Godwin, Ernest, Saori, Hellen, Sakai, Mukit, Max, San, Sam, Sen, Seb, All, Ito, Iki, Manu, Sant, Sain, Sato, Sein, Syia, Kato, Luis, Thom, Ness, Eder, Ivan, Iwan, Saint, and Yamada