Cognomen Buyan (Buyan 
, Буян 
, Буиан ) , all over the world, is quite a common family name. The surname Buyan is characteristic of Mongolia, where it is quite a common surname, Belarus, where it is quite a rare surname, and Philippines. In absolute terms, it is the most numerous in Philippines, Bangladesh, and Mongolia. Much less frequently, Buyan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Buyan | Bangladesh, India, Philippines, Mongolia, Turkey |
| Буян | Georgia, Kazakhstan, Ukraine, Belarus, Russia |
| Буиан | Russia |
| buyan kelmish granddaughter of Khublai khan (b. 1250) |
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| necla buyan researcher (ORCID 0000-0003-3220-8335) |
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| buyan suldus Chief amir of the Chagatai khanate |
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| amanda buyan researcher |
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| guoerluote buyan Ming dynasty person CBDB = 123946 |
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| ivan buyan Ukrainian hip hop and rap performer, RU (b. 1988) |
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| buyan temür |
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| buyan han |
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