Surname Касиваги (Jotei 
, Kashiwagi 
, 柏木 ) , worldwide, is quite a rare cognomen. The surname Касиваги is characteristic of Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Finland. Measured by absolute frequency, this name is the most popular in Japan, the United States, and China. Likewise, Касиваги is the forename as well as the last name.