Around the world, Kaisen (开森 
, 凯森 , Kaisen 
) is quite a rare masculine given name. The forename Kaisen is characteristic of Azerbaijan, where it is quite a rare boy's name, China, where it is a rare male name, and Kazakhstan. In absolute terms, it is the most numerous in China, Azerbaijan, and India. Very seldom, Kaisen is the last name as well as the forename.