Kushan Empire
Kosonsoy is an ancient place, its first settlements date back to times of Kushan Empire. The word "koson" came out from the word Kushan. Kosonsoy was an essential part of Kushan Empire together with ancient city Akhsikent, near Namangan city. There are still remains of ancient Mug Castle of Kushanids in the north part of the city. In other books is written that the "koson" means "big town" or "strong castle".