Surname Otsu (乙 
, オオツ 
, Otsu 
) , in the world, is a common last name. The surname Otsu is characteristic of China, where it is a rare surname, Japan, and Singapore. Measured by absolute frequency, this name is the most popular in China, Japan, and Brazil. More prevalently, Otsu is the forename as well as the last name.
| shinji otsu Japanese sailor (b. 1961) |
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| taisuke otsu economist (London School of Economics (LSE)) (b. 1973) |
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| wataru otsu researcher |
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| takayuki otsu researcher, Osaka City University, JP |
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| yo otsu researcher |
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| kaori otsu researcher (ORCID 0000-0001-7835-0949) |
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| makoto otsu researcher |
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| kinya otsu researcher |
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| akane otsu |
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| nobuyuki otsu |
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