Cognomen Исии (Ishii 
, 石井 , Isii 
) , around the globe, is quite a common family name. The cognomen Исии is habitual in Paraguay, where it is quite a rare surname, Singapore, and Japan. Measured by absolute frequency, it most frequently occurs in Japan, Brazil, and the United States. Very seldom, Исии is the forename as well as the last name.