Surname ボリソフ (Borisov 
, ボリソフ) , worldwide, is a common cognomen. The surname ボリソフ is habitual in Bulgaria, where it is a common surname, Lithuania, where it is quite a rare surname, and Estonia. Measured by absolute frequency, it is the most numerous in Bulgaria, Russia, and the United States. Much less frequently, ボリソフ is the forename as well as the last name.