Cognomen Кусаиын (Кусаиын 
) , all over the world, is an extremely rare last name. The surname Кусаиын is habitual in Central Asia, particularly Kazakhstan, where it is a very rare surname. More frequently, Кусаиын is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Кусаиын | Kazakhstan |