Last name Kolossow (Колосов 
, Kolossow 
) , around the world, is a common cognomen. The cognomen Kolossow is characteristic of Eastern Europe, particularly Russia, where it is quite a common surname, Belarus, and Ukraine, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Колосов | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |
| Kolossow | Brazil, Germany |