In all the world, Yiyu (Yiyu 
, 一愚 , 益宇 ) is quite a rare mostly male, but seldom feminine given name. The first name Yiyu is characteristic of Afghanistan, where it is a rare boy's name, China, where it is a rare dominantly masculine, but seldom girly name, and the United States, where it is an extremely rare unisex name. Much less frequently, Yiyu is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Yiyu | United States, Taiwan, Afghanistan, Malaysia, China |
| 益宇, 奕宇, 一愚 | China |
| yiyu yao researcher ORCID ID = 0000-0001-6502-6226 (b. 1962) |
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| yiyu feng researcher |
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| yiyu cheng researcher |
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| yiyu yao Ph.D. University of Regina 1991 |
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| yiyu yin researcher (ORCID 0000-0003-0351-4077) |
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| yiyu shi Ph.D. University of California, Los Angeles 2009 |
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| yiyu zhou researcher |
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| yiyu liang Ph.D. Beijing Normal University 2015 |
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| yiyu chou researcher |
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| yiyu wang researcher (ORCID 0000-0001-7248-0646) |
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| yiyu lu researcher (ORCID 0000-0001-6378-5552) |
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| yiyu dong researcher |
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| yiyu lu researcher (ORCID 0000-0002-6897-5918) |
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| yiyu zhang researcher (ORCID 0000-0003-3201-0468) |
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| yiyu zhang researcher (ORCID 0000-0002-3411-2735) |
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