Cognomen Kolosovskaia (Колосовская 
, Kolosovskaia 
) , in the entire world, is quite a rare last name. The surname Kolosovskaia is habitual in Belarus, where it is quite a rare surname, Russia, and Kazakhstan, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Колосовская | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |
| Kolosovskaia | Russia, Mexico, Georgia |