Surname ヒサシ (Hisashi 
, ヒサシ , Hisasi 
) , all over the world, is a common cognomen. The cognomen ヒサシ is habitual in Japan, where it is quite a common surname, Singapore, where it is a rare surname, and China, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Japan, China, and Indonesia. Very seldom, ヒサシ is the forename as well as the last name.