Cognomen Kosaka (コサカ 
, Kosaka 
, Косака 
) , in all the world, is quite a rare last name. The surname Kosaka is habitual in Hong Kong, where it is a rare surname, Latvia, and Japan. Not in comparison with a country's population, it is the most numerous in Japan, Brazil, and the United States. More prevalently, Kosaka is the forename as well as the last name.
| katsundo kosaka Japanese painter (b. 1901) |
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| ichirō kosaka Japanese photographer (b. 1909) |
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| yasuko kosaka Japanese photographer, JP (b. 1940) |
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| kosaka kunitsugu (b. 1943) |
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| kenji kosaka (b. 1944) |
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| hirokazu kosaka (b. 1958) |
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| grace kosaka actor, writer and producer (b. 1973) |
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| lyanne kosaka Brazilian table tennis player, BR (b. 1974) |
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| shiho kosaka researcher |
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| takeo kosaka researcher (ORCID 0000-0002-4371-4594) |
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| yoshimasa kosaka researcher |
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| aiko kosaka researcher |
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| wataru kosaka researcher ORCID ID = 0000-0002-2445-5099 |
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| hideo kosaka researcher ORCID ID = 0000-0002-3778-7236 |
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| priscila m kosaka researcher ORCID ID = 0000-0003-4242-7064 |
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