Family name 市井 (市井 
) , in all the world, is an extremely rare cognomen. Predominantly, 市井 is the forename as well as the last name.
| 市井三郎 Japanese philosopher, JP (b. 1922) |
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| 市井静香 Japanese AV idol, JP (b. 1982) |
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| 市井紗耶香 Japanese singer, actress and dancer, JP (b. 1983) |
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