Cognomen Исихара (Ishihara 
, 石原 , Isihara 
) , around the globe, is quite a rare last name. The last name Исихара is characteristic of Japan, where it is a rare surname, Lithuania, and Singapore. Measured by absolute frequency, this name is the most popular in Japan, the United States, and Brazil. Likewise, Исихара is the forename as well as the last name.