Globally, Sayoko (Sayoko 
, Саёко) is quite a rare dominantly feminine, but infrequently boy's first name. The first name Sayoko is habitual in Japan, where it is quite a rare girly name, Brazil, where it is a rare boy's name, and Indonesia, where it is a very rare unisex name. Very seldom, Sayoko is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Sayoko | Japan, China, Indonesia, United States, Brazil |
Sayoko is also a name for the fictitious and mythical characters: Sayoko Mishima , the fictional character from Oh My Goddess!.
| sayoko shibuya (b. 1933) |
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| sayoko maeda badminton player, JP (b. 1951) |
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| sayoko takebayashi badminton player, JP (b. 1957) |
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| sayoko e moroi researcher |
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| sayoko yamaguchi researcher (ORCID 0000-0003-4255-9411) |
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| sayoko shinya researcher |
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| sayoko ishizeki researcher (ORCID 0000-0002-6546-2658) |
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| sayoko kotani researcher |
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| sayoko yonemoto researcher |
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| sayoko hashimoto |
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