Cognomen Kyryllov (Кириллов 
, Kyryllov 
) , across the world, is a common family name. The cognomen Kyryllov is habitual in Russia, where it is quite a common surname, Belarus, where it is quite a rare surname, and Kazakhstan. Measured by absolute frequency, it is the most numerous in Russia, Kazakhstan, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Кириллов | Azerbaijan, Kazakhstan, Russia, Belarus, Ukraine |
| Kyryllov | Brazil, Ukraine, Estonia |