Family name Knys (Knys 
, Книс 
) , in all the world, is a very rare last name. The cognomen Knys is characteristic of Kazakhstan, where it is a rare surname, Lithuania, and Kyrgyzstan, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Kazakhstan, Russia, and Lithuania. Likewise, Knys is the forename as well as the last name.