Family name Ryo (Ryo 
, リョウ , ريو 
) , all around the world, is a widespread cognomen. The cognomen Ryo is habitual in Japan, where it is a common surname, Sudan, where it is quite a rare surname, and France. Not in comparison with a country's population, it is the most numerous in Japan, Indonesia, and France. Much less frequently, Ryo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ryo | United States, Japan, Indonesia, France, China |
| リョウ | Japan |
| ريو | Saudi Arabia, Algeria, Syria, Iraq, Sudan |
| Рё | Russia, China |
| monique ryo French politician, FR (b. 1949) |
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| bernard ryo French politician, FR (b. 1953) |
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| meehae ryo Korean cellist (b. 1967) |
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| ik-tong ryo director and filmmaker |
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| eiji ryo researcher (ORCID 0000-0003-4626-5234) |
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| masahiro ryo researcher ORCID ID = 0000-0002-5271-3446 |
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| kyung-ho ryo researcher |
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