In the entire world, Ryuichiro (Ryuichiro 
) is a rare masculine first name. The given name Ryuichiro is characteristic of Eastern Asia, particularly Japan, where it is a very rare male name, and China, where it is an extremely rare male name. Likewise, Ryuichiro is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Ryuichiro | Japan, China, Spain, United States, Brazil |
| ryuichiro machida (b. 1953) |
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| ryuichiro akagi researcher |
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| ryuichiro nakato researcher |
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| ryuichiro kobuchi researcher |
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| ryuichiro atarashi researcher |
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| ryuichiro machida Japanese entomologist, JP |
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| ryuichiro okawa researcher |
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| ryuichiro kanda researcher |
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| ryuichiro kajikawa researcher (ORCID 0000-0003-2318-2292) |
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| ryuichiro sato researcher (ORCID 0000-0001-6995-4732) |
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| ryuichiro hirano researcher |
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| ryuichiro ishitani researcher |
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| ryuichiro kimura researcher |
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| ryuichiro suzuki researcher (ORCID 0000-0002-3492-1671) |
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| ryuichiro shinohara researcher |
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