Family name Ysyn (Исин 
, Ysyn 
) , all around the world, is quite a rare surname. The cognomen Ysyn is habitual in Kazakhstan, where it is quite a rare surname, Azerbaijan, and Bulgaria, where it is a rare surname. In absolute terms, it is the most numerous in Kazakhstan, Azerbaijan, and Russia. Much less frequently, Ysyn is the forename as well as the last name.