Family name Kolosow (Kolosow 
) , in the world, is a very rare cognomen. The last name Kolosow is characteristic of Germany, where it is a very rare surname, Argentina, where it is an extremely rare surname, and Canada. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Argentina. Also, Kolosow is the forename as well as the last name.