Last name 忠男 (忠男 
) , all around the world, is a rare surname. The last name 忠男 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 忠男 is the forename as well as the last name.
| 市岡 忠男 Japanese baseball player (1891-1964), JP (b. 1891) |
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| 勝 忠男 JP (b. 1926) |
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| 日景 忠男 Japanese businessperson (1937-2015), JP (b. 1937) |
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| 満井 忠男 JP (b. 1934) |
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| 鈴木 忠男 JP (b. 1945) |
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