Last name 孝一 (孝一 
) , in the world, is a very rare cognomen. The surname 孝一 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 孝一 is the forename as well as the last name.
| 不破 孝一 Japanese journalist (1937-2012), JP (b. 1937) |
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| 小栗 孝一 JP (b. 1929) |
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| 宮田 孝一 Japanese banker, JP (b. 1953) |
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| 谷田貝 孝一 JP (b. 1957) |
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