Cognomen Ryu (リュウ 
, Ryu 
, 龍 , and others...) , around the world, is a common family name. The surname Ryu is characteristic of South Korea, where it is quite a common surname, Japan, and Luxembourg, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Eastern Asia, particularly South Korea, China, and Japan. Very seldom, Ryu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| リュウ, リュ | Japan |
| Ryu | South Korea, Japan, Indonesia, United States, China |
| 龍 | China |
| ريو | Saudi Arabia, Iraq, Sudan, Syria, Algeria |
| Рю | Kazakhstan, Kyrgyzstan, Russia, Ukraine |
| ריו | Israel |
| 류 | South Korea |
Jagi, Janagi, Janai, Ju, Riju, Riyu, Rju, Rou, Ryoo, Ryou, Ryuh, Ryuu, Ryù, Ryû, Ryō, Ryū, Rÿu, Yagi, Yanagi, Yanai, Yu, Риу, Рйу, Рью, Рёу, Ю, Яги, Янаги, Янаи, ริว, やない, やなぎ, 儿玉, 儿瑜, 儿语, 儿钰, 儿雨, 儿鱼, 兒魚, 劉, 吕, 尔予, 尔于, 尔余, 尔宇, 尔愚, 尔昱, 尔浴, 尔煜, 尔玉, 尔瑜, 尔祤, 尔禹, 尔禺, 尔育, 尔语, 尔遇, 尔钰, 尔雨, 尔鱼, 柳, 竜, and Ｒｙｕ
| ryu gwan (b. 1346) |
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| ryu ryang (b. 1354) |
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| ryu sun (b. 1441) |
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| ryu bu (b. 1470) |
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| ryu gwan (b. 1484) |
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| ryu jeon (b. 1531) |
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| ryu yeong-gyeong (b. 1550) |
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| ryu rim (b. 1581) |
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| ryu hu-jo (b. 1799) |
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| gye-jun ryu (b. 1879) |
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cindy ryu American politician, US (b. 1957) |
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| ryu jun-sang South Korean politician (1909-) (b. 1909) |
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| paul k. ryu Korean jurist, president of Seoul National University (b. 1915) |
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| ryu sung-gap (b. 1909) |
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| choshun ryu (b. 1912) |
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