Across the world, Jiajia (Jiajia 
, 加加 , 佳加 ) is quite a common epicene forename. The forename Jiajia is characteristic of Singapore, where it is a rare feminine name, Afghanistan, where it is a rare gender-neutral name, and Hong Kong, where it is a rare feminine name. In absolute terms, it most frequently occurs in China, Afghanistan, and Indonesia. Much less frequently, Jiajia is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Jiajia | Taiwan, China, Indonesia, United States, Afghanistan |
| 佳加, 加加 | China |
| Йиайиа | Russia |
| jiajia liu researcher ORCID ID = 0000-0003-2569-1840 |
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| jiajia wang researcher ORCID 0000-0002-1843-3977 |
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| jiajia song researcher (ORCID 0000-0002-0248-6513) |
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| jiajia ye researcher (ORCID 0000-0002-6550-300X) |
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| jiajia zhai researcher |
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| jiajia li researcher (ORCID 0000-0002-8996-5583) |
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| jiajia pan researcher |
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| jiajia zhou researcher ORCID ID = 0000-0002-0605-5745 |
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| jiajia lin researcher ORCID ID = 0000-0002-1493-2832 |
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| jiajia wang researcher (ORCID 0000-0001-6179-4404) |
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| jiajia zhang researcher ORCID 0000-0002-1259-0592 |
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| jiajia liu researcher (ORCID 0000-0002-2350-6421) |
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| jiajia jiang researcher (ORCID 0000-0001-7954-7727) |
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| jiajia sun researcher |
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| jiajia guo researcher |
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