Throughout the world, Siyi (Siyi 
) is a rare unisex forename. The first name Siyi is characteristic of Singapore, where it is a rare feminine name, the Democratic Republic of the Congo, and Australia, where it is a very rare female name. Measured by absolute frequency, it is the most numerous in China, the Democratic Republic of the Congo, and Indonesia. Much less frequently, Siyi is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Siyi | Democratic Republic of the Congo, China, United States, Japan, Taiwan |
| siyi he researcher |
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| siyi hu researcher |
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| siyi chen researcher (ORCID 0000-0003-1844-5860) |
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| siyi ding researcher (ORCID 0000-0001-5446-0254) |
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| siyi zhu researcher (ORCID 0000-0003-2552-2203) |
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| siyi zhang researcher (ORCID 0000-0001-8669-5285) |
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| siyi sun researcher |
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| siyi yan researcher |
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| siyi ming researcher |
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| siyi xu researcher ORCID ID = 0000-0002-8808-4282 |
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| siyi chen researcher (ORCID 0000-0002-3090-6183) |
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| siyi pan researcher (ORCID 0000-0001-9526-679X) |
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| siyi pan researcher (ORCID 0000-0001-5017-5536) |
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| siyi liu researcher 0000-0003-0206-9661 |
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| ge siyi Ming dynasty person CBDB = 250881 |
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