Family name Ōi (大井 
, אוי 
, Ōi) , around the globe, is a very rare cognomen. The last name Ōi is characteristic of Israel, where it is a very rare surname, and China, where it is an extremely rare surname. More frequently, Ōi is the forename as well as the last name.
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ōi no kata wife of Japanese daimyo Takeda Nobutora (b. 1497) |
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| ōi masatsugu (b. 1550) |
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| toshihiro ōi politician |
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| ōi nobuhiro |
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| ōi nobusada |
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