Last name Onishi (オオニシ 
, Onishi 
, 大西 ) , throughout the world, is quite a rare family name. The last name Onishi is habitual in Paraguay, where it is quite a rare surname, Bolivia, and Taiwan, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Brazil, Japan, and the United States. More frequently, Onishi is the forename as well as the last name.
| seiji onishi JP (b. 1935) |
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| ronaldo onishi politician from Brazil, BR (b. 1971) |
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| paulo cesar onishi politician from Brazil, BR (b. 1972) |
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| yuki onishi Chef and Founder of world’s first Michelin-starred ramen - Tsuta, JP (b. 1979) |
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| richard onishi American politician, US |
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| natsuko onishi researcher |
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| naoya onishi researcher |
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| kristine h. onishi professor and researcher in cognitive neuroscience |
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| kayoko onishi researcher |
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| masayuki onishi researcher |
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| shumpei onishi researcher |
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| alex c onishi researcher (ORCID 0000-0001-8488-3602) |
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| hidenori onishi researcher (ORCID 0000-0002-8442-9140) |
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| rumiko onishi researcher (ORCID 0000-0001-8283-7880) |
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| yuji onishi researcher |
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