Around the globe, Исао (Isao 
, Isaso 
, Исао 
) is quite a rare predominantly masculine, but very seldom feminine first name. The first name Исао is habitual in Japan, where it is quite a rare boy's name, Israel, where it is a rare unisex name, and Canada, where it is a very rare masculine name. In absolute terms, the name is most common in Japan, India, and China. Also, Исао is the last name as well as the forename.