Cognomen 勉 (勉 
, Hiura 
) , around the globe, is quite a common surname. The last name 勉 is habitual in China, where it is a rare surname, Hong Kong, and Peru, where it is a very rare surname. In absolute terms, it most frequently occurs in China, the United States, and Indonesia. More frequently, 勉 is the forename as well as the last name.
| 靱 勉 JP (b. 1904) |
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| 村田 勉 JP (b. 1909) |
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| 加計 勉 JP (b. 1923) |
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| 藤井 勉 Japanese painter, JP (b. 1948) |
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| 並河 勉 JP (b. 1939) |
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| 米山 勉 Japanese businessman, JP (b. 1956) |
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| 垂木 勉 Japanese seiyū and actor, JP (b. 1958) |
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| 伊沢 勉 Japanese actor, JP (b. 1958) |
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| 島袋 勉 Japanese runner, JP (b. 1963) |
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