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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 | Mongolia, Bangladesh, Philippines, Turkey, India |
| Буян | Kazakhstan, Georgia, Russia, Belarus, Ukraine |
| Буиан | Russia |