In all the world, Yunkai (云开 
, Yunkai 
, 运凯 ) is quite a common mostly male, but seldom feminine forename. The first name Yunkai is habitual in Eastern Asia, particularly China, where it is a rare dominantly boy's, but uncommonly feminine name. Much less frequently, Yunkai is the last name as well as the forename.
| VARIANT | COUNTRY |
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| 允凯, 云开, 运凯 | China |
| Yunkai | China, Canada, Chile, United States, Taiwan |
| yunkai li researcher (ORCID 0000-0002-3686-1967) |
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| yunkai jiang researcher |
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| yunkai wang researcher (ORCID 0000-0002-2979-1569) |
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| yunkai zhai researcher |
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| yunkai li researcher ORCID 0000-0003-4226-3805 |
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| yunkai chen Ph.D. Ohio University 1988 |
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| yunkai liu Ph.D. West Virginia University 2005 |
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| yunkai sun researcher (ORCID 0000-0001-8044-4936) |
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| yunkai hu researcher (ORCID 0000-0002-4805-9496) |
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| yunkai wei researcher |
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| yunkai zhou Ph.D. Rice University 2002 |
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| yunkai zhu researcher |
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| yunkai wu researcher (ORCID 0000-0003-2859-9169) |
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| yunkai zhang |
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