All over the world, Seijiro (Seijiro 
) is a very rare masculine forename. The given name Seijiro is characteristic of Eastern Asia, particularly China, where it is an extremely rare male name. More prevalently, Seijiro is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Seijiro | Japan, China, Switzerland, United States, Brazil |
| seijiro shimada researcher (ORCID 0000-0002-6605-1252) |
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| seijiro sato Japanese politician |
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| seijiro furukawa Japanese electrical engineer |
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| seijiro hosokawa researcher |
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| seijiro matsubara researcher |
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| seijiro nishimoto |
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