All around the world, 大井 (大井 
, Оои 
, Ōi) is a rare epicene first name. The first name 大井 is habitual in Eastern Asia, particularly China, where it is an extremely rare gender-neutral name. Very seldom, 大井 is the last name as well as the forename.
| 大井朝光 JP (b. 1198) |
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| 大井光長 JP (b. 1219) |
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| 大井光泰 JP (b. 1249) |
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| 大井光矩 JP (b. 1337) |
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| 大井行俊 JP (b. 1427) |
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| 大井政朝 JP (b. 1450) |
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| 大井貞隆 JP (b. 1450) |
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| 大井行満 JP (b. 1453) |
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| 大井安房丸 JP (b. 1465) |
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| 大井行真 JP (b. 1484) |
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| 大井行頼 JP (b. 1509) |
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| 大井信為 JP (b. 1530) |
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| 大井行吉 JP (b. 1542) |
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| 大井政成 JP (b. 1548) |
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| 大井田景国 JP (b. 1550) |
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