Cognomen Osako (Osako 
, Осако) , in the entire world, is quite a rare last name. The last name Osako is habitual in the Democratic Republic of the Congo, where it is a rare surname, Uganda, and Czechia. Not in comparison with a country's population, the name is most common in the Democratic Republic of the Congo, Brazil, and Uganda. Very seldom, Osako is the forename as well as the last name.
| tatsuo osako Japanese saviour of Jews (b. 1917) |
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| john osako American judoka, US (b. 1921) |
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| tomo osako researcher (ORCID 0000-0001-9250-4035) |
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| takao osako researcher |
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| kiyomi osako researcher |
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| yuma osako researcher ORCID ID = 0000-0002-7214-4076 |
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| zuzana osako (b. 1982) |
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