In the world, Ryusei (Ryusei 
) is a rare masculine forename. The first name Ryusei is characteristic of Eastern Asia, particularly Japan, where it is a rare male name. Also, Ryusei is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Ryusei | Japan, China, Taiwan, Thailand, United States |
| ryusei oketani researcher (ORCID 0000-0001-7860-2456) |
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| ryusei kuma researcher (ORCID 0000-0002-8419-7466) |
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| ryusei sugimoto researcher |
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| ryusei momosaki researcher (ORCID 0000-0002-1477-3341) |
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| ryusei uchio researcher (ORCID 0000-0001-5924-4534) |
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| ryusei ito Japanese association football player |
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| ryusei takao Japanese association football player |
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| ryusei melody takeuchi Ph.D. Tufts University 2017 |
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| ryusei makiguchi Japanese tennis player (1991-), JP (b. 1991) |
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| ryusei shimodo Japanese association football player (b. 1996) |
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| ryusei kumagai Japanese kickboxer |
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